Because: 

Seven Wonders of the World page receives about 5000 sessions every day.

7 Wonders of the World page has been appearing on many search engines on various key words like 7 wonders, Seven wonders of the world, 7 wonders…

The page has a Google Page Rank of 5 and has a good position on several keywords related to the Seven Wonders of the World.

The page also has a Yahoo Page Rank of 5 and has a good position on several keywords related to the Seven Wonders of the World.

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