1: 1. Mount Roraima - A stunning tabletop mountain in South America. 2. Pamukkale - Thermal pools and terraces in Turkey's Denizli Province. 3. Glowworm Caves - Waitomo, New Zealand, where glowworms light up caves.

2: 4. Zhangjiajie National Forest Park - China's "Avatar" mountains. 5. Salar de Uyuni - World's largest salt flat in Bolivia. 6. Antelope Canyon - Smooth, colorful walls in Arizona's Navajo Nation.

3: 7. The Door to Hell - A natural gas field in Turkmenistan. 8. Fly Geyser - A man-made geyser in Nevada. 9. Socotra Island - Unique flora and fauna off the coast of Yemen.

4: 10. The Great Blue Hole - Giant underwater sinkhole off the coast of Belize. 11. Cappadocia - Turkey's fairy chimneys and underground cities. 12. Meteora - Greece's monasteries perched atop sandstone pillars.

5: 13. The Wave - Swirled rock formation in Arizona's Vermilion Cliffs. 14. McMurdo Dry Valleys - Antarctica's ice-free valleys. 15. Skellig Michael - Irish island topped with ancient monastic settlement.

6: 16. The Bermuda Triangle - Infamous region of mysterious disappearances. 17. Jigokudani Monkey Park - Japanese snow monkeys in hot springs. 18. Moravian Fields - Flower-filled fields in the Czech Republic.

7: 19. Chocolate Hills - Mounds in the Philippines that turn brown in dry season. 20. Stone Forest - Limestone formations in China. 21. Lake Retba - Pink lake in Senegal, colored by algae.

8: 22. Zhangye Danxia Landform - Colorful rock formations in China. 23. Richat Structure - "Eye of the Sahara" in Mauritania. 24. Hagia Sophia - Istanbul's ancient domed cathedral-turned-mosque.

9: 25. Puma Punku - Mysterious ruins in Bolivia's Altiplano region. 26. Madagascar's Avenue of the Baobabs - Iconic tree-lined avenue. 27. Devil's Tower - Wyoming's igneous rock formation.

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