1. Empire State Building - New York City, USA
2. Willis Tower (formerly Sears Tower) - Chicago, USA
3. Taipei 101 - Taipei, Taiwan
4. Burj Khalifa - Dubai, UAE
5. One World Trade Center - New York City, USA
6. Petronas Twin Towers - Kuala Lumpur, Malaysia
7. Lotte World Tower - Seoul, South Korea
8. The Shard - London, UK
9. Eiffel Tower - Paris, France (originally built with wrought iron but later reinforced with steel)
10. CN Tower - Toronto, Canada.
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