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China's 'heavenly pits': The giant sinkholes that have ancient forests growing withinChina's southwestern karst landscape is pockmarked with dozens of enormous sinkholes that look like they were made with a cookie cutter — and scientists keep finding new ones.
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Snake Island: The isle writhing with vipers where only Brazilian military and scientists are allowedSnake Island was isolated from the Brazilian mainland at the end of the last ice age, trapping Earth's only known population of highly venomous golden lancehead pit vipers on a rock in the Atlantic.
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Fairy Chimneys: The stone spires in Turkey that form 'the world's most unusual high-rise neighborhood'Turkey's magical "fairy chimneys" in Cappadocia were carved out of an ancient volcanic landscape over millions of years before humans turned them into hiding dens.
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Cave of Crystals: The deadly cavern in Mexico dubbed 'the Sistine Chapel of crystals'The Cave of Crystals in Chihuahua, Mexico, is buried almost 1,000 feet (300 meters) beneath Earth's surface and contains giant gypsum crystal beams that are up to 37 feet (11 m) long.
