View from "Bridge of Sighs."
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View from "Bridge of Sighs."
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Gorin's Dome.
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Gorin's Dome.
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Gorin's Dome.
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Entrance to "Long Route."
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Giant's Coffin.
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Giant's Coffin.
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Entrance to "Rocky Hall."
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Wandering Willie's Spring.
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Wandering Willie's Spring.
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Wandering Willie's Spring.
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Devil's Arm Chair.
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The Altar.
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The Altar.
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Column of Hercules."
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Column of Hercules."
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Column of Hercules."
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Gothic chapel."
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Gothic chapel."
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Mouth of the cave.
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Mouth of the cave.
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Path leading to the mouth of cave.
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Curious sand-stone rock.
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Burt's Cave, near Maquoketa River, Jackson County, Iowa.
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Burt's Cave, near Maquoketa River, Jackson County, Iowa.
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Roof in Crystal Palace.
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The organ, Manitou Grand Caverns.
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Wind cave.
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Piwyack Cave.
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