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TBT Carlsbad Caverns 1923
This photo was taken in 1923 inside Carlsbad Caverns National Park, New Mexico shows a wall in the chambers known as Shinav's Wigwam (from Shinav, a mythical deity of the Navajo Indians). The stalactites have grown together laterally to form a solid curtain-like mass. Original public domain image from Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use