History House - The stories behind history - some irreverent
National Park Services - biology, geology, ecology, history.
Original historical documents. Some resources are available at no cost.
Portal to all Smithsonian sites. [portal history science]
National Endowment for the Humanities site including resources for social studies, history, literature, and language arts. Lesson plans, theme of the month.
HistoryWired - an experimental site developed by the Smithsonian. Features a unique system for classifying objects in multiple ways.
DoHistory - provides a specific case allowing the exploration of the historian's craft
Collection of historical resources related to the African American experience.
Lewis and Clark in North Dakota [history]
Library of Congress - American Memory Collection. Historical primary sources. [history]