Online Exhibits - The National Archives
(includes an exhibition called Picturing the Century)
http://www.archives.gov/exhibits/index.html

LIFE photo archive hosted by Google
photos (many unpublished) from the 1750s - today.  sorted by decade.  can also search using the search box
http://images.google.com/hosted/life

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Historyteacher.net
http://www.historyteacher.net/index.htm

Best of History Web Sites - by Thomas Daccord
Contains links to MANY sites in the areas of world history, U.S. history and art history.  Some sites include primary sources, lesson plans and/or maps.
http://www.besthistorysites.net

EyeWitness to History.com
http://www.eyewitnesstohistory.com

History Matters:  The U.S. Survey Course on the Web
Click on "www.history" to find a list of web sites sorted by various topics and time periods.
http://historymatters.gmu.edu

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

HyperHistory Online
http://www.hyperhistory.com/online_n2/History_n2/a.html

Global History & Geography 2R Course Units – Pete Kruppenbacher
http://www.lakelandschools.us/lh/pkruppenbacher/Units.htm

INCORE Internet Country Guides
http://www.incore.ulst.ac.uk/cds/countries/index.html

NARA - U.S. National Archives & Records Administration
http://www.archives.gov

American Memory:  Historical Collections for the National Digital Library
http://rs6.loc.gov/amhome.html

Intute:  Arts and Humanities - History
the advanced search feature has many options - you can limit results to primary sources
http://www.intute.ac.uk/artsandhumanities/history/

Our Documents – 100 Milestone Documents – National History Day, The National Archives and Record Administration and USA Freedom Corps
http://www.ourdocuments.gov

EuroDocs:  Online Sources for European History
http://eudocs.lib.byu.edu/index.php/Main_Page

Ancient Mesopotamia:  This History, Our History
http://mesopotamia.lib.uchicago.edu/

World Digital Library
http://www.wdl.org