7 Wonders of the World?

I always hear people say "so-and-so is the 8th wonder of the world" but what are the other 7? There's more than just 7 wonders of the world. There are probably like thousands and thousands.

• 7 wonders of the ancient world
• 7 wonders of the medieval mind
• 7 natural wonders of the world
• 7 underwater wonders of the world
• 7 wonders of the modern world
• 7 forgotten natural wonders of the world
• 7 forgotten modern wonders of the world
• 7 forgotten medieval wonders of the world

Those are 56 wonders of the world.
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7 Wonders of the Modern World

1. The Empire State Building

2. The Itaipu Dam

3. The CN tower

4. The Panama Canal

5. The Channel Tunnel

6. The North Sea Protection Works

7. The Golden State Bridge