The Encyclopedia of Cleveland History

The definitive source of information regarding the history of Cleveland, Ohio.
http://ech.cwru.edu/

Encyclopedia of 1848 Revolutions

Articles about the people and ideas motivating the 1848 European revolutions. Most articles have bibliographies.
http://cscwww.cats.ohiou.edu/~Chastain/index.htm

Perseus Encyclopedia of Ancient Greece

Short definitions and articles about ancient Greece.
http://hydra.perseus.tufts.edu/cgi-bin/text?lookup=encyclopedia+toc

World Hyperhistory

HyperHistory Online navigates through 3,000 years of world history with timelines of civilizations (plus maps), people, and events.
http://www.hyperhistory.com/online_n2/History_n2/a.html

Palestine

All what you need to know about the current history of Palestine.
http://www.palestinehistory.com/

ORB: Online Reference Book for Medieval Studies

Short articles with links to other web resources about European history from the Roman empire to 1300.
http://the-orb.net/

Cunnan

User edited encyclopedia of the middle ages operated by the Society for Creative Anachronism.
http://www.sca.org.au/cunnan/wiki/Main_Page

Military History Encyclopedia

Reference for all military history - wars, individuals, battles, weapons and the concepts behind warfare.
http://www.historyofwar.org/