Lincoln Memorial
U.S. Capitol Building
Library of Congress
Basel, Switzerland, Airport
(have silver jeton commem.)
Mostly, I am waiting for the world's Mintmasters to commemorate the places I have been, rather than my going to the places they think of.
New York City has everything from The Empire State Building to the Brooklyn Bridge, including the Rockefeller Center, Times Square, Park Avenue, Greenwich Village, etc., etc.
Kennedy Space Center.
Chicago Museum of Science and Industry
Hunting Morrell Mushrooms from Harrison, Michigan
(much more, but not so interesting...

)