The Metropolitan Museum of Art, New York
New York City's Metropolitan Museum of Art is the largest art museum in the US and one of the 10 largest in the world. We're talking about more than two million works, in 17 curatorial departments in its significant art collection. The main building is on the eastern edge of Central Park and its collections of ancient art include Greek, Roman and Near Eastern.
Smithsonian National Museum of Natural History, Washington D.C.
Washington D.C.'s Smithsonian National Museum of Natural History is one of 19 museums and galleries in the Smithsonian museum and research complex. This is another museum with a mind-boggling number of exhibits... more than 126 million specimens. The main building measures 123,000 square metres and there are more than 1000 staff. Like most Smithsonian museums, entry is free and it's open every day except Christmas Day.