1: 1. The Door to Hell in Turkmenistan burns continuously for over 50 years.
2: 2. The Great Blue Hole in Belize is a giant marine sinkhole, perfect for diving.
3: 3. The Blood Falls in Antarctica features red water flowing from a glacier.
4: 4. The Salar de Uyuni in Bolivia is the world's largest salt flat.
5: 5. The Stone Forest in China is a surreal landscape of limestone pillars.
6: 6. The Fly Geyser in Nevada is a man-made geyser creating a colorful spectacle.
7: 7. The Mount Roraima in Venezuela inspired Sir Arthur Conan Doyle's "The Lost World."
8: 8. The Socotra Island in Yemen boasts unique flora and fauna found nowhere else.
9: 9. The Waitomo Glowworm Caves in New Zealand are illuminated by bioluminescent insects.
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