ArtLex
Art Dictionary: more than 2600 terms covering all aspects of art; provides basic definitions as well as illustrations, quotations and links to other resources.
ECHO European Cultural Heritage Online
ECHO, part of the Europeana digital library, provides access to nearly two million digital objects including film, photos, paintings, sounds, maps, manuscripts, books, newspapers, and other documents.
The Internet Modern History Sourcebook
The Internet Modern History Sourcebook is one of a series of history primary sourcebooks. It is intended to serve the needs of teachers and students of modern European history, American history, modern Western Civilization, and World Cultures.
Library of Congress Prints and Photographs
Provides 65% of their holdings - about 1 million images.
Metropolitan Museum of Art
The largest art museum in the United States. See “Timeline of Art History”.
MoMA (Museum of Modern Art)
A valuable resource for modern art history research.
NYARC: New York Art Resources Consortium
Arcade unites the collections of the Frick Art Reference Library and the libraries of the Brooklyn Museum and The Museum of Modern Art.
NYPL Digital Gallery
New York Public Library's images digitized from primary sources, maps, prints, photographs, books and ephemera.
Smithsonian Archives of American Art
Thirteen million documents about American visual arts from the 18th to mid-20th centuries.
World Wide Web Virtual Library: History of Art
Collection of links relating to art history, hosted by King’s College, UK.