Library of Congress
Loc: Become a Historical Detective
Search American Memory collections and play the role of a detective in this lesson plan that seeks to find out if Billy the Kid really was killed by Pat Garrett at Fort Sumner, New Mexico.
Yale University
Yale New Haven Teachers Institute: The Aztecs: A Pre Columbian History
This site contains several lesson plans, a teacher bibliography, a student reading list, and a large amount of background information on the Aztecs.
Gilder Lehrman Institute of American History
Gilder Lehrman Institute: Age of Exploration
[Free Registration/Login Required] Learn about the exploration of the Americas. Site includes primary source documents, videos, essays, and lesson plans to help students research the exploration of the new land.