LIFE photo archive, K-12

http://images.google.com/hosted/life
This is an amazing resource that is a collaboration between Google and LIFE. Millions of photos are available to learn about U.S. history and world events. Many of the photos were never published. Users can search by keyword, browse by decade, or explore featured events, people, or places. Names of photographers and the dates that photos were taken are identified. With images ranging from the 1750s to the 2000s, the site will be popular with users wanting images with historical context.