A very good question! I've limited my choices to those I have personally seen. Here they are listed in chronological order:
1. The Great Pyramids of Giza, Egypt
2. The Temple of Karnak, Luxor, Egypt
3. The Great Wall of China, China
4. Hagia Sophia, Istanbul, Turkey
5. Sainte-Chapelle, Paris, France
6. Nasrid Palace at the Alhambra, Granada, Spain
7. St Peter's Basilica, Vatican City
8. Taj Mahal, Agra, India
9. Palace of Versailles, France
10. Sheikh Zayed Grand Mosque, Abu Dhabi, UAE
An honourable mention should go to the Incheon Grand Bridge in South Korea.
[Edited: 2012 Mar 12 20:44 - The Travel Camel:11053 ]
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