Encyclopedia Smithsonian
http://www.si.edu/resource/faq/start.htm

History Channel online
www.historychannel.com

World History

Social Studies for teachers and Students
http://www.li.net/~ndonohue/ssworld.html

Religion

www.materialreligion.org

Geography

http://home.att.net/~rmmwms/geography.html

National Geographic Online
http://www.nationalgeographic.com/

Modern World History

Internet Modern History Source Book
http://www.fordham.edu/halsall/mod/modsbook.html

United States History

http://hometown.aol.com/TeacherNet

http://www.historyplace.com/unitedstates

History Net.com
http://www.TheHistoryNet.com/