Metropolitan Museum of Art, New York

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http://www.metmuseum.org/

One of the largest art museums in the world, its collections include more than two million works of art�several hundred thousand of which are on view at any given time�spanning more than 5,000 years of world culture, from prehistory to the present. Site has an educational section for different age levels and interests, including �Looking at Art,� which discusses composition and theme.