1. The Sydney Opera House shines at night as the city turns off its lights to mark " Earth Hour " in 2007.
2. Taking photos in front of the Sydney Opera House, eating lobster or feeding kangaroos are among the traditional activities for tourists visiting Australia.
3. The Opera House and Harbor Bridge in Sydney will power down for an hour.
4. Sydney Opera House
4. The Opera House and Harbor Bridge in Sydney of Australia will power down for an hour.
5. Thousands watched on a big screen near the Opera House at Circular Quay in Sydney.
6. The United States'Statue of Liberty and Australia's Sydney Opera House have been sitting in the bottom 10 since the start.
7. The Statue of Liberty and Australia's Sydney Opera House were near the bottom of the list from the start.
8. With APEC leaders meeting inside the Sydney Opera House on the harbor foreshores, navy divers and special forces will patrol Sydney Harbor.
9. The dramatic water vista of the bridge together with the nearby Sydney Opera House is an iconic image of both Sydney and Australia.