Eiffel Tower - Been up there once. Nice view, unclean city, rude people.
Great Wall of China - Never been there!
Hoover Dam - Driven over it, walked in it. Very cool. Grand Coulee Dam is as impressive, BTW.
Great Pyramids - Most impressive! Climbed the Great Pyramid, sat on the top stones that remain up there, and watched the predawn over Cairo. Awesome!!
Statue of Liberty - What can you say? BTW, Thank you France.
United Nations (in NY) - OK, but there are more impressive buildings in NYC.
Kennedy Space Center (Apollo Program) - Very cool.
Sistine Chapel (Mike's Cathedral) - A most Awe-Inspring sight. If you get to Rome, do not miss it. It does make this citizen happy!!!!
Galapagos Islands (Darwin's) - Been to lots of exotic islands, but not those!
Cambridge U (Newton's College) - Nice, esp. by American standards. I liked Oxford, too.
So I really had the choice of the Great Wall, or the Galapagos... and it was pretty easy, I'd like to visit the Great Wall! I'd like to do it in a "Free China", too

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