Sybil's Cave, Hoboken, New Jersey by Hobokenmuseum

Sybil's Cave - three views, from left: portal and entrance gate; view into the mouth; view looking out from the back of the cave.
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A 19th century man-made cave in the cliffs at the Hudson River, 8th St. and Frank Sinatra Drive. A natural spring at the spot led to the 1830s creation of Sybil's Cave by the Stevens family as an attraction on the west side of the Hudson River for New Yorkers visiting Hoboken. The spring water was sold for 2 pennies a glass.
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Mary Rogers and Edgar Allan Poe are part of the cave's legend. You can find out more below.
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The cave was closed to the public in the late 19th C. and "lost" for decades until the early 2000s. It was re-opened and a new portal, a tribute to the original carved stone, was built. In 2008, it was re-dedicated as a small city park, but the cave itself is not open to visitors.
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There is a lot more about the cave in the Museum's online catalog:
hoboken.pastperfect-online.com/32340cgi/mweb.exe?request=keyword;keyword="sybils  cave";dtype=i
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www.hobokenmuseum.org 
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For the Gigapan community: the image here is obviously a composite of three stitched gigapans and re-worked in Photoshop. The most interesting one is the last where the 6x11 gigapan used only natural lighting and required some long exposures, up to 2-1/2 seconds at F8 with a Nikon D90.