The Museum of Natural History
New York, NY
A surreal world of giant dinosaurs, dioramas, floating whales, and stars (there's a planetarium on site, not to mention a Butterfly Conservatory with 500 live butterflies), the Museum of Natural History is the largest museum of its type in the world and features over 32 MILLION artifacts. Then again, you may know it best as the museum in those zany Ben Stiller movies. Either way, it's pay what you wish.