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'Abd-Allâh ibn Ubayy of the 'Awf tribe and two friends sit before the cave of a hermit priest and question him about Muhammad.

'Abd-Allâh ibn Ubayy of the 'Awf tribe and two friends sit before the ...

Life of the Prophet Muhammad written at the order of the Mamluk sultan al-Mansûr 'Alâ' al-Dîn 'Alî (d. 778/1376). The work was first illustrated during the reign of the Ottoman sultan Murâd III.

Valley and Ruins of Khureitun, from the Cave of Adullam

Valley and Ruins of Khureitun, from the Cave of Adullam

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

Wind cave. - Sterescope Card, Colorado. NYPL Collection.

Wind cave. - Sterescope Card, Colorado. NYPL Collection.

Colorado 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

The grotto known as the "school of the prophets,"  to which pilgrimmages are made by Mohammadans, in honor of Elijah. The house on the left is modern but occupies the site of an ancient chapel.  It is opposite the entrance of the cave.

The grotto known as the "school of the prophets," to which pilgrimmag...

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

Burt's Cave, near Maquoketa River, Jackson County, Iowa.

Burt's Cave, near Maquoketa River, Jackson County, Iowa.

Iowa 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

Mouth of the cave. Kentucky. Stereoscope Card.

Mouth of the cave. Kentucky. Stereoscope Card.

Kentucky 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

Cave on Grove Street. Mississippi. 19th century stereoscope card.

Cave on Grove Street. Mississippi. 19th century stereoscope card.

Mississippi 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 ... More

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

Niagara Falls, 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 Ne... More

Entrance to Cave of the Winds. - stereoscopic view, public domain photorpaph

Entrance to Cave of the Winds. - stereoscopic view, public domain phot...

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

Ice cave. New York Sterecope Card.

Ice cave. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Cave of the Winds, Niagara on the line of the Canada Southern Railway.

Cave of the Winds, Niagara on the line of the Canada Southern Railway.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

The Hermit's Cave, winter, Niagara. New York Sterecope Card.

The Hermit's Cave, winter, Niagara. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice mountains in front of Cave of the Winds, Niagara.

Ice mountains in front of Cave of the Winds, Niagara.

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

Hermit's Cave, Goat Island. New York Sterecope Card.

Hermit's Cave, Goat Island. 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

Group at cave. Rhode Island. 19th century stereoscope card.

Group at cave. Rhode Island. 19th century stereoscope card.

Rhode Island 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... More

The cave, looking south. New York Sterecope Card.

The cave, looking south. 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

Catline Cave. New York Sterecope Card.

Catline Cave. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Hermit's Cave, Goat Island. New York Sterecope Card.

Hermit's Cave, Goat Island. 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

Cave Rock, Lake Tahoe. Sterescope Cards NYPL Collection.

Cave Rock, Lake Tahoe. Sterescope Cards NYPL Collection.

Nevada 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 assem... More

Bower Cave, Yosemite. Sterescope Cards NYPL Collection.

Bower Cave, Yosemite. 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

From under the Cave, looking south-westerly.

From under the Cave, looking south-westerly.

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

The lake, near the cave, Central Park, N.Y.

The lake, near the cave, Central Park, N.Y.

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

Ice cave in front of American Falls.

Ice cave in front of American Falls.

Niagara Falls, 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 Ne... More

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

Niagara Falls, 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 Ne... More

Entrance to Cave of the Winds. - stereoscopic view, public domain photorpaph

Entrance to Cave of the Winds. - stereoscopic view, public domain phot...

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

Niagara Falls, 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 Ne... More

[Path to the Cave of the Winds.]

[Path to the Cave of the Winds.]

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Niagara. Entrance to Cave of the Winds, winter.

Niagara. Entrance to Cave of the Winds, winter.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Cave of the Winds. New York Sterecope Card.

Cave of the Winds. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

In front of Cave of the Winds, winter, Niagara on line of N. Y. C. & H. R. R. R..

In front of Cave of the Winds, winter, Niagara on line of N. Y. C. & H...

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Cave of the Winds, Niagara. New York Sterecope Card.

Cave of the Winds, Niagara. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

Ice Cave, under Horse-Shoe Fall.

Ice Cave, under Horse-Shoe Fall.

Niagara Falls, 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 Ne... More

Pirate's Cave (No. 2), Newport, R.I

Pirate's Cave (No. 2), Newport, R.I

Rhode Island 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... More

McCartney's Cave, near Mammoth Springs, Yellowstone National Park.

McCartney's Cave, near Mammoth Springs, Yellowstone National Park.

Wyoming 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 asse... More

Lower Pa-ro-gunt (largest cave lake).

Lower Pa-ro-gunt (largest cave lake).

Colorado 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

Williams Canyon, Cave of the Winds.

Williams Canyon, Cave of the Winds.

Picryl description: Public domain image of a mountain cliff view, natural rocky landscape, free to use, no copyright restrictions.

Whirlwind Bridge and Rock of Ages, Cave of the Winds.

Whirlwind Bridge and Rock of Ages, Cave of the Winds.

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

Book illustration - [Section of the cave.] Book by John Lloyd Stephens 1805-1852
From Hyde's Cave, looking up. New York Sterecope Card.

From Hyde's Cave, looking up. 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

Looking out from the cave, Glens Falls, N.Y.

Looking out from the cave, Glens Falls, N.Y.

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

Central Park. View from interior of Cave, looking out.

Central Park. View from interior of Cave, looking out.

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

The Cave, from the Ramble. New York Sterecope Card.

The Cave, from the Ramble. 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

Rustic Stone Arch, near the Cave.

Rustic Stone Arch, near the Cave.

Picryl description: Public domain image of a park, woods, trees, arbor, outdoors, romantic landscape, 17th-18th century, free to use, no copyright restrictions.

The cave. New York Sterecope Card.

The cave. 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

Ice cave under Horse Shoe Falls, Niagara.

Ice cave under Horse Shoe Falls, Niagara.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice cave, Niagara. New York Sterecope Card.

Ice cave, Niagara. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice Cave, under Horse-Shoe Fall.

Ice Cave, under Horse-Shoe Fall.

Niagara Falls, 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 Ne... More

Marine Cascade, near Spouting Cave. Rhode Island. 19th century stereoscope card.

Marine Cascade, near Spouting Cave. Rhode Island. 19th century stereos...

Rhode Island 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... More

Georgia; Blue Spring, near the "W.T." Ranch, Black River, New Mexico. Typical New Mexican spring that gushes out a river from start; Corral near ranch (Frank's) In rock cave of water formation, New Mexico, Rocky Arroya; Dark Cañon, near Frank's ranch, N.M. Horsemen at foot of cliff. Typical southwestern rock formation, lime and sandstone.
Williams Canyon, Cave of the Winds.

Williams Canyon, Cave of the Winds.

Picryl description: Public domain image of a mountain cliff view, natural rocky landscape, free to use, no copyright restrictions.

Bay of the Lake at the mouth of the Cave.

Bay of the Lake at the mouth of the Cave.

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

Path to the Cave of the Winds. - stereoscopic view, public domain photorpaph

Path to the Cave of the Winds. - stereoscopic view, public domain phot...

Picryl description: Public domain image of a quarry, mine, excavation, or mining site, free to use, no copyright restrictions.

Cave fall, Glen Onoko. 19th century Pennsylvania stereoscope card.

Cave fall, Glen Onoko. 19th century Pennsylvania stereoscope card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Cave, Cupica Bay.19th century US expeditions surveys.

Cave, Cupica Bay.19th century US expeditions surveys.

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

Hebron with mosque covering the cave of Macpelah

Hebron with mosque covering the cave of Macpelah

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

The cave under the Great Rock on Mount Moriah

The cave under the Great Rock on Mount Moriah

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

Charles-Émile Jacque - [Un homme dans une cave.]

Charles-Émile Jacque - [Un homme dans une cave.]

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

"Putnam Wolf Den" [a small cave?], Pomfret, Conn.

"Putnam Wolf Den" [a small cave?], Pomfret, Conn.

Connecticut 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 ... More

Mouth of the cave. Kentucky. Stereoscope Card.

Mouth of the cave. Kentucky. Stereoscope Card.

Kentucky 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

The Wanderer at Palisade Cave. Lake Superior, Michigan. Stereoscope card.

The Wanderer at Palisade Cave. Lake Superior, Michigan. Stereoscope ca...

Michigan 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

Mishe-mo-kwa cave. 19th century stereoscopic views of Minnesota

Mishe-mo-kwa cave. 19th century stereoscopic views of Minnesota

Missouri 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

Snow Cave, White Mountain, N.H. New Hampshire in 19th century. Stereoscope card.

Snow Cave, White Mountain, N.H. New Hampshire in 19th century. Stereos...

New Hampshire 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

Cave and Falls above the Flume, Franconia Mountains, N.H.

Cave and Falls above the Flume, Franconia Mountains, N.H.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Howe's Cave, Washington Hall. New York Sterecope Card.

Howe's Cave, Washington Hall. 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

Ice cave in front of American Falls.

Ice cave in front of American Falls.

Niagara Falls, 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 Ne... More

Cave of the Winds, rainbow. New York Sterecope Card.

Cave of the Winds, rainbow. 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

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

"Rock of Ages" and Whirlwind Bridge, Cave of the Winds.

Niagara Falls, 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 Ne... More

Path to the Cave of the Winds, Niagara.

Path to the Cave of the Winds, Niagara.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice cave, Niagara Falls. New York Sterecope Card.

Ice cave, Niagara Falls. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Niagara in winter, Crystal Cave below Table Rock.

Niagara in winter, Crystal Cave below Table Rock.

Picryl description: Public domain image of a glacier, arctic landscape, mountains landscape, ice, rocks, free to use, no copyright restrictions.

[Interior view of cave, winter.] New York Sterecope Card.

[Interior view of cave, winter.] New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

An Old Niagara Guide, looking into the awe-inspiring Cave of the Winds, Niagara Falls, U.S.A.

An Old Niagara Guide, looking into the awe-inspiring Cave of the Winds...

Niagara Falls, 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 Ne... More

Cave of the Winds. New York Sterecope Card.

Cave of the Winds. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Whirlwind Bridge and Rock of Ages, Cave of the Winds.

Whirlwind Bridge and Rock of Ages, Cave of the Winds.

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

In and about the Dells of Wisconsin River. Looking out of Boat Cave.

In and about the Dells of Wisconsin River. Looking out of Boat Cave.

Wisconsin 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 as... More

Cave, Limon Bay.19th century US expeditions surveys.

Cave, Limon Bay.19th century US expeditions surveys.

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

Burt's Cave, near Maquoketa River, Jackson County, Iowa.

Burt's Cave, near Maquoketa River, Jackson County, Iowa.

Iowa 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

Turtle's cave. Massachusetts 19th century stereoscope card.

Turtle's cave. Massachusetts 19th century 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

Cave Falls. New Hampshire in 19th century. Stereoscope card.

Cave Falls. New Hampshire in 19th century. Stereoscope card.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Cave under Lookout Mountain. Tennessee Stereoscope Card. 19th century.

Cave under Lookout Mountain. Tennessee Stereoscope Card. 19th century.

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

The traditional cave of Adullam, at Khureitun.  The above is the largest chamber of this labyrinthine grotto

The traditional cave of Adullam, at Khureitun. The above is the large...

Public domain scan of an art print, free to use, no copyright restrictions image - Picryl description

Mouth of the cave. Kentucky. Stereoscope Card.

Mouth of the cave. Kentucky. Stereoscope Card.

Public domain reproduction of illuminated book page, free to use, no copyright restrictions image - Picryl description

Fountain cave, St. Paul. 19th century stereocard of Saint Paul MN.

Fountain cave, St. Paul. 19th century stereocard of Saint Paul MN.

Minnesota 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 as... More

Rocky Shores and Beach near Spouting Cave, Newport, R.I.

Rocky Shores and Beach near Spouting Cave, Newport, R.I.

Rhode Island 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... More

Grotte de la Nativité : la crêche. = Cave of the Nativity : the manger.

Grotte de la Nativité : la crêche. = Cave of the Nativity : the manger...

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

Stalactites in the Bridal Chamber, Cave of the Winds.

Stalactites in the Bridal Chamber, Cave of the Winds.

Colorado 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

Entrance to Mammoth Cave, Ky. Kentucky. Stereoscope Card.

Entrance to Mammoth Cave, Ky. Kentucky. Stereoscope Card.

Kentucky 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

Mouth of the cave. Kentucky. Stereoscope Card.

Mouth of the cave. Kentucky. Stereoscope Card.

Kentucky 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

Fountain cave -- looking out. 19th century stereocard of Saint Paul MN.

Fountain cave -- looking out. 19th century stereocard of Saint Paul MN...

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

Fountain cave near Fort Snelling. New York Sterecope Card.

Fountain cave near Fort Snelling. 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

View from Cave Rock, looking north, Glens Falls, N.Y.

View from Cave Rock, looking north, Glens Falls, N.Y.

Picryl description: Public domain image of a rural landscape with a watermill, water, decayed building, 18th, 19th century architecture, free to use, no copyright restrictions.

Near Cave of the Winds. New York Sterecope Card.

Near Cave of the Winds. New York Sterecope Card.

Picryl description: Public domain image of a waterfall, water stream, cascade, nature site, free to use, no copyright restrictions.

On the way to the Cave of the Winds, Niagara, N.Y.

On the way to the Cave of the Winds, Niagara, N.Y.

Picryl description: Public domain image of a quarry, excavation or mining site, free to use, no copyright restrictions.

Ice mountains in front of Cave of the Winds, Niagara.

Ice mountains in front of Cave of the Winds, Niagara.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice Cave, front American Falls, Niagara, N.Y.

Ice Cave, front American Falls, Niagara, N.Y.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Ice Grotto, Cave of the Winds, Niagara, N.Y.

Ice Grotto, Cave of the Winds, Niagara, N.Y.

Picryl description: Public domain image of a waterfall, cascade, water stream, free to use, no copyright restrictions.

Candle Ice Cave, under Horse-Shoe Fall.

Candle Ice Cave, under Horse-Shoe Fall.

Niagara Falls, 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 Ne... More

Cave rocks, East Caln Township, Chester Co., Pa.

Cave rocks, East Caln Township, Chester Co., Pa.

Pennsylvania 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... More

Rocky Shore, near near Spouting Cave, Newport, R.I.

Rocky Shore, near near Spouting Cave, Newport, R.I.

Rhode Island 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... More

Cave under Lookout Mountain. Tennessee Stereoscope Card. 19th century.

Cave under Lookout Mountain. Tennessee Stereoscope Card. 19th century.

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

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