Roaring out of Auyan-Tepui’s wall, a waterfall plummets over 3,000 feet in Venezuela, March 1963.Photograph by Thomas J. Abercrombie, National Geographic

Roaring out of Auyan-Tepui’s wall, a waterfall plummets over 3,000 feet in Venezuela, March 1963.Photograph by Thomas J. Abercrombie, National Geographic