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During the dry season, when the Zambezi River is at its lowest, a natural rock ledge at the very lip of Victoria Falls creates the world's highest and most dangerous infinity pool. Adventuresome swimmers can wade through the enclosed patch of water known as the "Devil's Swimming Pool" to the precipice of the 100-meter falls and look down upon the gorge below.

More photos of the Devil's Swimming Pool can be seen on Atlas Obscura.

Places to swim while contemplating your mortality:

• Singapore's Marina Bay Sands Resort pool, the largest pool at its elevation gives the appearance of an abrupt drop-off at 650 feet in the air
• The Cage of Death in Darwin, Australia, gives visitors the chance to swim a glass wall away from 2,000-pound crocodiles
• The Nurse Sharks of Compass Cay, Bahamas, look like predators, but make for friendly swimming partners