NINES: Nineteenth-Century Scholarship Online
"Devoted to forging links between the material archive of the nineteenth century and the digital research environment of the twenty-first."
EuroDocs is an online directory of primary documents in Western European history compiled by Richard Hacken, librarian at Brigham Young University.
Highly recommended.
The Digital Library of the National Library of France (compare with American Memory, Library of Congress)
The National Archives of the United Kingdom (compare with NARA in the U.S.)
Online collection highlight: U.K. Cabinet Papers: 1915-1980
The following databases provide electronic reproductions of full-text primary-source books and other texts. See also the Find Books tab.
The following database index and in most cases provide electronic reproductions of full-text primary source journals and newspapers.
More help locating historical documents online and in libraries and archives throughout the country and world...
From Fordham University. "The Internet History Sourcebooks Project is a collection of public domain and copy-permitted historical texts presented cleanly (without advertising or excessive layout) for educational use."
These collections of still photographs and other images constitute an invaluable record of the past.