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Kilimanjaro's giant groundsels: The strange plants that thrive on Africa's tallest mountainGiant groundsels are rare plants that grow up to 30 feet (9 meters) tall. They are endemic to the slopes of Mount Kilimanjaro, a dormant volcano in Tanzania and Africa's tallest mountain.
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North America's 'broken heart': The billion-year-old scar from when the continent nearly ripped apartThe Midcontinent Rift is a giant tear that formed in what is now the U.S. Midwest 1.1 billion years ago. Nicknamed North America's "broken heart," it is filled with solidified magma and lava.
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Jellyfish Lake: Palau's saltwater pool with a toxic bottom and surface waters brimming with millions of jellyfishPalau's Jellyfish Lake is home to millions of endemic golden jellies that live in the lake's top layer but never venture below 50 feet, where the water is saturated with poisonous gas.
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El Cono: The mysterious sacred 'pyramid' hidden deep in the Amazon rainforestCerro El Cono is a solitary, pyramidal hill in the Peruvian Amazon rainforest whose origins remain mysterious and that holds spiritual significance for Indigenous people.
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Corryvreckan whirlpool: Scotland's 'raging cauldron' that is named after a Norse king and said to house a witchThe Corryvreckan whirlpool is one of the largest whirlpools in the world, reaching speeds of 8.5 knots and producing a roaring sound that can be heard 10 miles away.
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Iran's folded rocks: The crumpled mountains at the intersection of Asia and EuropeIran's folded rocks are a colorful formation that is part of the Greater Caucasus mountains, which formed when the Eurasian tectonic plate collided with the Arabian plate millions of years ago.
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Wilkes Land crater: The giant hole in East Antarctica's gravitational field likely caused by a meteoriteResearchers have proposed many origins for a gravity anomaly in Wilkes Land, East Antarctica, but the latest evidence suggests the subglacial hole is an impact crater measuring 315 miles across.
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Rainbow Mountains: China's psychedelic landscape created when 2 tectonic plates collidedThe colorful swirls and stripes that characterize China's Rainbow Mountains would have remained hidden without the epic tectonic collision that created the Himalayas.
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Lake Salda: The only place on Earth similar to Jezero crater on MarsLake Salda, in southwestern Turkey, bears a close resemblance to Mars' Jezero crater, which is currently being sampled by NASA's Perseverance rover.
