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Antarctica 'pyramid': The strangely symmetrical mountain that sparked a major alien conspiracy theoryAntarctica is home to a peak shaped like a perfect pyramid — but contrary to what conspiracy theorists say, the mountain's four symmetrical faces were forged through natural processes.
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Tristan da Cunha: The most remote inhabited island on Earth, forged from a supercontinent breakupTristan da Cunha is a group of islands in the South Atlantic that formed from the breakup of the supercontinent Gondwana. Today, it's home to a tiny and extremely isolated farming community.
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Kawah Ijen: The volcano in Indonesia that holds the world's largest acidic lake at its heartKawah Ijen is an active volcano on the island of Java with an extremely acidic crater lake and gas emissions that produce blue flames upon contact with oxygen in Earth's atmosphere.
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Denmark Strait cataract: The world's largest waterfall, hidden underwater and unlike any other on landThe Denmark Strait cataract is a sloping portion of the seafloor between Iceland and Greenland that funnels cold water from the Nordic Seas into the Irminger Sea, fueling Atlantic Ocean currents.
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Marble Caves: Chile's ethereal turquoise caverns with 'mineral ice cream' on the wallsThe Marble Caves sit on the shores of a turquoise glacial lake in southern Chile. Light bounces off the water onto the walls, creating a magical, ever-changing display inside the caverns.
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Fossil Forest, Dorset: England's 145 million-year-old tree stump fossils preserved by ancient microbesThe Fossil Forest in Dorset is a stretch of southern English coastline peppered with living mounds of limestone that hide the remains of cypress trees from the late Jurassic period.
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Hailin impact crater: China's newly discovered meteor pit born from a 'nuclear explosion level' eventThe Hailin impact crater is a newly-discovered scar in the mountains of Northeast China left behind by a meteor impact, but geologists aren't sure exactly when this happened.
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El Ojo: The mysterious floating island in Argentina's swampland that looks like a perfectly round eyeArgentina's El Ojo is said to harbor UFOs and the ghosts of ancient deities, but as far as scientists can tell, the island is simply a fluke of nature that formed through erosion and water currents.
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Hang Son Doong: The world's biggest cave, so 'outrageous in size' it fits 2 jungles and the 'Great Wall of Vietnam'Vietnam's Son Doong cave is so large, you could squeeze 15 Great Pyramids of Giza inside it and fly a Boeing 747 airplane through some of its passages.
