50 Amazing Museum Exhibits You Can Enjoy Online is a site with a list of 50 different museums and exhibits that can be viewed online. The list is separated by categories - Art and Culture, History, Natural History, and Science and Technology - and includes links to such museums as the Louvre, Museum of Modern Art, Colonial Williamsburg, National Museum of Natural History, and NASA.
These sites can be used as virtual field trips and as ways to explore different concepts and topics without leaving the class room.