Lonely Planet has ranked the world's top 500 tourist attractions for their forthcoming book, Ultimate Travel. How many have you been lucky enough to visit? There's only one U.S. attraction in the top ten; take a guess which one it is, and then read on:
10. Aya Sofya, Turkey (pictured)
9. Alhambra, Spain
8. Iguazu Falls, Brazil and Argentina
7. Colosseum, Italy
6. Grand Canyon National Park, United States
5. Taj Mahal, India
4. Great Wall of China
3. Machu Picchu, Peru
2. Great Barrier Reef, Australia
1. Temples of Angkor, Cambodia
Source: Lonely Planet