Encyclopedia Britannica

Encyclopedia Smithsonian

Juvenile Encyclopedias

Fact Monster Encyclopedia - Part encyclopedia and part homework helper, this site is divided by subject.

Specialty Encyclopedias

Catholic Encyclopedia

CIA World Factbook - Contains cultural, geographical, and political information for over 250 countries

Emily Post's Online Encyclopedia of Etiquette

Enyclopedia of Christianity

Encyclopedia Mythica - Encyclopedia of mythology, folklore, and traditions

Internet Encyclopedia of Philosophy - Peer-Reviewed source of philosophy from all over the world.

IMDB - Internet Movie Database - Information on movies and actors

MusicBrainz - Open source of musical metadata

Symbols.com - Information about symbols, signs, flags, and glyphs