The Metropolitan Museum of Art

Easily one of the world's must-see art museums, and arguably the best one in the U.S. Huge collection with a great quality-to-quantity ratio, jam-packed with anthology level canvases. Depending on your interests, this is probably the museum to see if you can only see one. The $20.00 price is steep, but luckily it's a suggested donation, not a mandatory admission -- be prepared for dirty looks from the admissions desk if you go the cheapskate's route.

then this is a must see.... It is HUGE though and there is no way you can see everything. Make sure you have an idea of what you want to see because if not you'll get tired of walking around and looking at paintings... The Greco paintings, the Velasquez paintings, and the painting of George Washington crossing hte Delaware River are pivotal to see...