Sharing is easy—and it helps more than you know.
1. Stonehenge
2. Grand Canyon
3. Great Barrier Reef
4. Petra
5. Temple of Artemis
6. Colosseum
7. Westminster Abbey
8. Pyramid
9. Leaning Tower of Pisa
10. Acropolis of Athens
11. Eiffel Tower
12. Kremlin, Moscow
13. Sydney Opera House
14. Arc de Triomphe
15. Dome of the Rock
