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Yonkers pressure tunnel. Completed section of standard circular type of tunnel 16 feet 7 inches in diameter. Station-marking tile on left. Contract 54. November 21, 1913.

Yonkers pressure tunnel. Completed section of standard circular type o...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Yonkers pressure tunnel. View showing completed grading around Shaft 8. Contract 12. August 23, 1917.

Yonkers pressure tunnel. View showing completed grading around Shaft 8...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Camps. Croton Lake pressure tunnel. ... Contract 24. May 6, 1910.

Camps. Croton Lake pressure tunnel. ... Contract 24. May 6, 1910.

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. View of steel arch forms and concrete platform. ... Contract 47. June 7, 1911.

Wallkill pressure tunnel. View of steel arch forms and concrete platfo...

Picryl description: Public domain image of a chamber, cell, interior, underground vault architecture, free to use, no copyright restrictions.

Van Cortland pressure tunnel. ... Contract 30. May 3, 1912.

Van Cortland pressure tunnel. ... Contract 30. May 3, 1912.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Surveys.  Taking cross-section with sunflower instrument in the City tunnel south of Shaft 16 after trimming had been done. March 14, 1913.

Surveys. Taking cross-section with sunflower instrument in the City t...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912.

Eastview tunnel. View showing forms in place with completed arch and s...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel on N. & W. R. R. - Lower End.

Tunnel on N. & W. R. R. - Lower End.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

The Natural Tunnel, [Scott County, Va.]

The Natural Tunnel, [Scott County, Va.]

Public domain illustrated book page scan, American, free to use, no copyright restrictions image - Picryl description

Machinery for compressing air, Hoosac Tunnel.

Machinery for compressing air, Hoosac Tunnel.

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

[Men and children posed at the blacksmith's shop at the east end of the tunnel.]

[Men and children posed at the blacksmith's shop at the east end of th...

Picryl description: Public domain image of a locomotive, train cars, railroad tracks, railway, 19th-20th century, free to use, no copyright restrictions.

Entrance to tunnel, east end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, east end. Massachusetts stereoscope card collectio...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Inside the Sutro Tunnel. Nevada. 19th century stereoscope card.

Inside the Sutro Tunnel. Nevada. 19th century stereoscope card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel, [railroad underpass] White Hall, N.Y.

Tunnel, [railroad underpass] White Hall, N.Y.

Public domain image of a large historic building, city hall, urban architecture, free to use, no copyright restrictions - Picryl description

Lower tunnel cascade, Fall Creek. New York Sterecope Card.

Lower tunnel cascade, Fall Creek. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Observatory and Tunnel, west side. New York Sterecope Card.

Observatory and Tunnel, west side. New York Sterecope Card.

Picryl description: Public domain image of a historic building in New York City, free to use, no copyright restrictions.

Tunnel. New York Sterecope Card. NYPL Collection.

Tunnel. New York Sterecope Card. NYPL Collection.

Public domain image of an arch structure, bridge, historic place ruins, classical architecture, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Spruce Creek tunnel. Stereoscope card.

Pennsylvania Railroad, Spruce Creek tunnel. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Looking out of the tunnel at Livermore Pass, Alameda County, Western Pacific Railroad.

Looking out of the tunnel at Livermore Pass, Alameda County, Western P...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel No. 2, near Wahsatch. 19th century stereoscope card. Utah.

Tunnel No. 2, near Wahsatch. 19th century stereoscope card. Utah.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunnel.]

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunne...

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

The Blue Ridge and C. & O. West from Mason Tunnel, Virginia

The Blue Ridge and C. & O. West from Mason Tunnel, Virginia

Picryl description: Public domain photo of a vintage Ohio postcard, free to use, no copyright restrictions image.

Raton tunnel on the A.T. & S.F. R.R. N.M.

Raton tunnel on the A.T. & S.F. R.R. N.M.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Map of routes to the Holland Tunnel.

Map of routes to the Holland Tunnel.

Public domain image of the vintage map from NYPL Lionel Pincus and Princess Firyal Map Division, free to use, no copyright restrictions image. The Lionel Pincus and Princess Firyal Map Division is one of the wo... More

Road and rocks near Summit Tunnel, Donner Peak in dist.

Road and rocks near Summit Tunnel, Donner Peak in dist.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Rondout pressure tunnel. View of foot of shaft showning 90-degree junction of shaft and tunnel. Contract 12. April 21, 1911.

Rondout pressure tunnel. View of foot of shaft showning 90-degree junc...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Yonkers pressure tunnel.  Contract 54. April 18, 1913.

Yonkers pressure tunnel. Contract 54. April 18, 1913.

Picryl description: Public domain image of a construction site, industrial or commercial building, free to use, no copyright restrictions.

Hudson pressure tunnel. View around the East test-shaft on east side of Hudson river. Shaft sunk by Board of Water Supply forces.  April 27, 1910.

Hudson pressure tunnel. View around the East test-shaft on east side o...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. ... Contract 47. May 25, 1910.

Wallkill pressure tunnel. ... Contract 47. May 25, 1910.

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recovered from holes along the line of the City tunnel. .. November 12, 1909.

Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recover...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Yonkers pressure tunnel. ... Contract 54. October 9, 1912.

Yonkers pressure tunnel. ... Contract 54. October 9, 1912.

Picryl description: Public domain image of a damaged, burned, or destroyed building, natural disaster, war destruction, ruins, 19th-century architecture, free to use, no copyright restrictions.

Camps. Rondout pressure tunnel. ... Contract 12. July 20, 1909.

Camps. Rondout pressure tunnel. ... Contract 12. July 20, 1909.

Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel.  Tunnel excavation showing operation on both bench and heading in progress. Contract 12. July 20, 1909.

Rondout pressure tunnel. Tunnel excavation showing operation on both ...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

[View of a tunnel.] New York Sterecope Card.

[View of a tunnel.] New York Sterecope Card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Cavern Tunnel, lower view. New York Sterecope Card.

Cavern Tunnel, lower view. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Interior of Railway Suspension Bridge. New York Sterecope Card.

Interior of Railway Suspension Bridge. New York Sterecope Card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Pennsylvania Railroad, Blairsville Tunnel. Stereoscope card.

Pennsylvania Railroad, Blairsville Tunnel. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Tunnel No. 3, Weber [River]. 19th century stereoscope card. Utah.

Tunnel No. 3, Weber [River]. 19th century stereoscope card. Utah.

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

Cavern Tunnel, lower view. New York Sterecope Card.

Cavern Tunnel, lower view. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Interior section of the Chicago Lake tunnel.

Interior section of the Chicago Lake tunnel.

Chicago Illinois stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker... More

The underground tunneling machine - driving the machine ahead.

The underground tunneling machine - driving the machine ahead.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Highland Park, Tunnel Walk, Pittsburgh, Pa.

Highland Park, Tunnel Walk, Pittsburgh, Pa.

Public domain photo of vintage Pennsylvania postcard, 19th century, free to use, no copyright restrictions image - Picryl description.

State Line Tunnel, Berkshire Hills, Mass.

State Line Tunnel, Berkshire Hills, Mass.

Public domain photo of vintage Massachusetts postcard, free to use, no copyright restrictions image - Picryl description

East Portal, Hoosac Tunnel, North Adams, Mass.

East Portal, Hoosac Tunnel, North Adams, Mass.

Public domain photo of vintage Massachusetts postcard, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel.  Concrete for walls of chamber over Drainage shaft in place.  ... Contract 47. November 10, 1911.

Wallkill pressure tunnel. Concrete for walls of chamber over Drainage...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910.

Rondout pressure tunnel. View looking up incline to platform from whic...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Organization. City tunnel. Celebration ceremonies attending the holing through of the last heading of the City tunnel. Contract 65. January 12, 1914.

Organization. City tunnel. Celebration ceremonies attending the holing...

Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description

Cooling-towers for powerhouse and air-conditioning ; Steam-plant ; Powerhouse pumproom ; Tunnel, factory to powerhouse.

Cooling-towers for powerhouse and air-conditioning ; Steam-plant ; Pow...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Washington Street tunnel, east entrance. Chicago Stereoscope Card Collection

Washington Street tunnel, east entrance. Chicago Stereoscope Card Coll...

Public domain image of a historic building, free to use, no copyright restrictions - Picryl description

Lowell water works tunnel. Lowell, Massachusetts. Stereoscope card.

Lowell water works tunnel. Lowell, Massachusetts. Stereoscope card.

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Cut and Tunnel between Garrisons and Cold Spring.

Cut and Tunnel between Garrisons and Cold Spring.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

The Tunnel, lower end, Havana Glen.

The Tunnel, lower end, Havana Glen.

New York State stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker w... More

Observatory and Tunnel. New York Sterecope Card.

Observatory and Tunnel. New York Sterecope Card.

Public domain image of an arch structure, bridge, historic place ruins, classical architecture, free to use, no copyright restrictions - Picryl description

The Inclined Railway, Prospect Park. New York Sterecope Card.

The Inclined Railway, Prospect Park. New York Sterecope Card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel through Lewiston Mountain, Niagara, N.Y.

Tunnel through Lewiston Mountain, Niagara, N.Y.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunnel.]

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunne...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

East from Mullen Tunnel Grade [showing log cabin below].

East from Mullen Tunnel Grade [showing log cabin below].

Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembled it over a period of mo... More

[High tressel, before tunnel no. 2.]

[High tressel, before tunnel no. 2.]

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

High tressel, before tunnel no. 2.

High tressel, before tunnel no. 2.

Utah stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembl... More

Portal of the Broadway tunnel.
Entrance to the ruins of Ba'albek.  At the south-west corner, through a long vaulted passage like a railway tunnel under the great platform. Two of these great vaults run parallel with each other, from east to west, and are connected by a third running at right angles to them from north and south.

Entrance to the ruins of Ba'albek. At the south-west corner, through ...

Public domain image of Egyptian art, free to use, no copyright restrictions photo - Picryl description

Hoosac Tunnel, Mass. Massachusetts stereoscope card collection, NYPL

Hoosac Tunnel, Mass. Massachusetts stereoscope card collection, NYPL

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

View of the cascade 200 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of the cascade 200 feet high, 1-4 mile up the creek, to the right...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Two column bent viaduct; traveler for erecting forms, central park tunnel - (in this tunnel ducts are built in the sidewalls).

Two column bent viaduct; traveler for erecting forms, central park tun...

Picryl description: Public domain image of a bridge, train viaduct, free to use, no copyright restrictions.

Yonkers pressure tunnel. Steel ribs for concrete forms, made up of 5-inch I-beams spaced 3 feet apart. Lagging plates placed as concrete is built up from the invert. Contract 54. May 1, 1912.

Yonkers pressure tunnel. Steel ribs for concrete forms, made up of 5-i...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Rondout pressure tunnel. View of head-frame and cage with muck car at Shaft 1. Contract 12. July 20, 1909.

Rondout pressure tunnel. View of head-frame and cage with muck car at ...

Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description

Yonkers pressure tunnel.  Structural-steel interlining before the concrete lining was placed. ...Contract 54. October 9, 1912.

Yonkers pressure tunnel. Structural-steel interlining before the conc...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Hudson pressure tunnel. View of Drainage shaft showing completed steel interlining, ..  Contract 90. December 12, 1913.

Hudson pressure tunnel. View of Drainage shaft showing completed steel...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel.  Head-frame, hoisting engine and bucket at top of Shaft 3. Contract 12. August 18, 1908.

Rondout pressure tunnel. Head-frame, hoisting engine and bucket at to...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Mekeel tunnel. View showing steel forms in place for concrete lining. Contract 2. June 27, 1911.

Mekeel tunnel. View showing steel forms in place for concrete lining. ...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Sarles tunnel. Completed trimming of tunnel shown in foreground. .. Contract 55. July 3, 1913.

Sarles tunnel. Completed trimming of tunnel shown in foreground. .. Co...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel.  Construction of Downtake chamber at junction of cut -and-cover aqueduct with Downtake shaft. Contract 12. July 19, 1911.

Rondout pressure tunnel. Construction of Downtake chamber at junction...

Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.

City tunnel. View of drainage drift showing section of steel interlining riveted to diaphragm. ...  Contract 65. June 24, 1914.

City tunnel. View of drainage drift showing section of steel interlini...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Camps. Rondout pressure tunnel. ... Contract 12. July 21, 1910.

Camps. Rondout pressure tunnel. ... Contract 12. July 21, 1910.

Public domain image of a romantic ruins landscape, classical architecture, free to use, no copyright restrictions - Picryl description

Wallkill pressure tunnel. Work of screeding concrete of invert in progress. Contrct 47, June 7, 1911.

Wallkill pressure tunnel. Work of screeding concrete of invert in prog...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150 feet below. Contract 20. February 16, 1910.

Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150...

Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description

Hudson pressure tunnel. View showing Drainage shaft with corrugated pipe columns, steel bolts and curb in position.  ... Contract 90. October 27, 1913.

Hudson pressure tunnel. View showing Drainage shaft with corrugated pi...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel. View of drainage drift with completed concrete lining. Bronze door in background. Contract 12. July 20, 1911.

Rondout pressure tunnel. View of drainage drift with completed concret...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel.  Columns set up with drills ready to operate in Shawangunk grit. Contract 12.  March 9, 1910.

Rondout pressure tunnel. Columns set up with drills ready to operate ...

Picryl description: Public domain image of a basement, underground, lobby, free to use, no copyright restrictions.

Wallkill pressure tunnel. View showing details of steel forms for concrete lining of pressure tunnels. Contract 47. October 5, 1910.

Wallkill pressure tunnel. View showing details of steel forms for conc...

Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description

In the tunnel, New Almaden. Sterescope Cards NYPL Collection.

In the tunnel, New Almaden. Sterescope Cards NYPL Collection.

California Stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who a... More

Entrance to tunnel, east end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, east end. Massachusetts stereoscope card collectio...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

View of tunnel, E.R.R. Massachusetts stereoscope card collection, NYPL

View of tunnel, E.R.R. Massachusetts stereoscope card collection, NYPL

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

[Raton tunnel on the A.T. & S.F. R.R. N.M.]

[Raton tunnel on the A.T. & S.F. R.R. N.M.]

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Toward Cavern Tunnel,. New York Sterecope Card.

Toward Cavern Tunnel,. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Tunnel under the Drive, Prospect Park, Brooklyn.

Tunnel under the Drive, Prospect Park, Brooklyn.

Picryl description: Public domain image of a historic building in New York City, free to use, no copyright restrictions.

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Tunnel near Greensburg. Stereoscope card.

Pennsylvania Railroad, Tunnel near Greensburg. Stereoscope card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Junc's R.R. tunnel under Market & Chestnut streets.

Junc's R.R. tunnel under Market & Chestnut streets.

Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.

Junc's R.R. [railroad] tunnel under Market & Chestnut Streets.

Junc's R.R. [railroad] tunnel under Market & Chestnut Streets.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

R. R. bridge & tunnel, Fairmount Park.

R. R. bridge & tunnel, Fairmount Park.

Picryl description: Public domain image of an arch bridge, stone architecture, free to use, no copyright restrictions.

Tunnel near Devil's Gate. 19th century stereoscope card. Utah.

Tunnel near Devil's Gate. 19th century stereoscope card. Utah.

Utah stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembl... More

West from Tunnel No. 4, Weber Canon.

West from Tunnel No. 4, Weber Canon.

Utah stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembl... More

The Summit Tunnel, 1,200 feet long, Livermore Pass, Alameda Co. looking through, Western Pacific Railroad.

The Summit Tunnel, 1,200 feet long, Livermore Pass, Alameda Co. lookin...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

East end of tunnel, showing bed of road.

East end of tunnel, showing bed of road.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel site in Glen Canyon. December 23, 1889. Beauty Point. Photograph by F.A. Nims.

Tunnel site in Glen Canyon. December 23, 1889. Beauty Point. Photograp...

Robert Brewster Stanton photographs Picryl description: Public domain photograph of National Park, nature, free to use, no copyright restrictions image.

Tunnel No. 6, Moffat Road, Colorado

Tunnel No. 6, Moffat Road, Colorado

Public domain photo of vintage Colorado postcard, 19th century, free to use, no copyright restrictions image - Picryl description.

Entrance to tunnel, west end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, west end. Massachusetts stereoscope card collectio...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

View of east end of tunnel looking out.

View of east end of tunnel looking out.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

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