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Hranice Abyss: The deepest freshwater cave on Earth and a conduit to a 'fossil' sinkholeScientists first described the flooded cave in 2016 but determined its extraordinary extent years later.
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Nazaré: The big-wave surfer's paradise born out of the largest underwater canyon in EuropeEvery year, record-seeking surfers and spectators descend on the small Portuguese town of Nazaré for the "big wave" season, when water can surge up to 100 feet (30 meters) tall.
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Rainbow swamp: The flooded forest in Virginia that puts on a magical light show every winterEvery winter, when sunlight hits at the right angle, visitors to Virginia's First Landing State Park are treated to a mesmerizing rainbow light show courtesy of the park's bald cypress swamp.
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Gateway to the underworld: The enormous permafrost 'megaslump' in Siberia that keeps getting biggerThe growing "gateway to the underworld," officially known as the Batagay megaslump, is the largest megaslump in the world and exposes permafrost layers that are 650,000 years old.
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White Shark Café: The mysterious meeting spot for great whites in the middle of the Pacific OceanEvery winter and spring, great white sharks that usually dwell off the coast of California gather in a remote section of ocean the size of Colorado — and scientists are slowly piecing together why.
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Al Naslaa rock: Saudi Arabia's enigmatic sandstone block that's split perfectly down the middleAl Naslaa is a rock formation in Saudi Arabia's northwestern desert consisting of two huge, symmetrical stone blocks that are separated by a mysterious gap and sit on small pedestals.
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Racetrack Playa: The home of Death Valley's mysterious 'sailing stones'In Racetrack Playa, a dry lakebed in Death Valley National Park, meteorological conditions can push rocks weighing up to 700 pounds along the flat ground.
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Yarlung Tsangpo: The deepest canyon on land hides a tree taller than the Statue of LibertyThe Yarlung Tsangpo Grand Canyon is Earth's largest terrestrial canyon, stretching 314 miles long and almost 20,000 feet from top to bottom at its deepest point in the Tibet Autonomous Region.
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Salar de Uyuni: The world's largest salt desert and lithium reservoir surrounded by volcanoesThe Salar de Uyuni desert is famous for its gleaming surface waters and hexagonal salt crust patterns, but below this otherworldly landscape lie about 11 million tons of highly sought-after lithium.
