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The Cave of Swallows, also called Sótano de las Golondrinas, is an open air pit cave in the Municipality of Aquismón, San Luis Potosí, Mexico.

Cave of Swallows: Schwalbenhöhle, Mexico Cave of Swallows is so deep, it's often said that the Chrysler building could easily fit within it. Its opening is the largest known in the world and entering it is not a small feat, hence the skydiver! Deceptive of its name, there are an abundance of various bird species living in holes on the cave walls.