1. The Eiffel Tower Steel Titanium Cast Iron Wrought Iron

2. The Statue of Liberty Cast Iron Steel Copper Wrought Iron

3. The dome over the U.S. Capitol Wrought Iron Cut Stone Brick Masonry Cast Iron

4. The Empire State Building Steel Wrought Iron Granite Limestone

5. The dome over the Pantheon Travertine Concrete Marble Brick

6. The Washington Monument Brick Wrought Iron Steel Stone

7. The Sydney Opera House Stone Prestressed Concrete Marble Steel

8. Taj Mahal Sandstone Brick Limestone Marble

9. Petronas Towers (Kuala Lampur, Malaysia - currently the tallest buildings in the world) Steel Titanium Carbon Fiber Concrete

10. Guggenheim Museum (New York City) Steel Stone Wrought Iron Concrete