shellgirl23
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Cave of Swallows in Aquismón, San Luis Potosi, Mexico, is an open air pit cave with the largest known cave shaft in the world.

Climbers at the bottom of the Golondrinas cave in Aquismon Region, Mexico. The towering walls of rock range from 325 feet tall to the deepest open-air pit in the world, Sotano de las Golondrinas (Cave of Swallows), which is over 1000 feet deep.