Huge iconic structure for your city

I realize that in 2005, the $$$$ isn't there. But what it if were?

If you could put a huge, iconic structure in your city, symbolic and blockbuster in nature, what would it be and where would you put it?

Now I'm not talking about a building.

The purest example I can give would be St. Louis's gateway arch, built for the purpose of giving its city a symbol. The Washington Monument would be another.

Others that work would include the Worlds Fair generated Eiffel Tower and Space Needle. Even a structure with an unsymbolic need would be acceptable...i.e. the broadcasting purpose of the CN Tower.>