Here are some helpful links for history research:
General
-Early Modern Letters Online (in beta)
It is a catalog of 48,817 letters.
-Euro Docs
http://eudocs.lib.byu.edu/index.php/Main_Page
European history rescources
-Medical History of American Presidents
http://www.doctorzebra.com/prez/index.htm
20th century
-Einstein Archives Online
Travel diaries, correspondence, and scientific notes of Albert Einstein.
-Oral Interviews of Jewish Survivors of the Holocaust
http://sounds.bl.uk/Oral-history/Jewish-Holocaust-survivors
http://sounds.bl.uk/Oral-history/Jewish-Holocaust-survivors
19th century
~Nothing Yet~
18th century
~Nothing Yet~
17th century
-Samuel Pepys' Diary
16th century
-Tudor England
http://englishhistory.net/tudor.html
Middle Ages (which I include with the Dark Ages)
~Nothing Yet~
Ancient
-Ancient History Encyclopediahttp://www.ancient.eu/
Art
-Essential Vermeer
http://www.essentialvermeer.com/
Includes an analysis of Vermeer paintings Great site!
-Royal Collection Trust
http://www.royalcollection.org.uk/
-Grand Ladies Site
http://www.gogmsite.net/
http://www.essentialvermeer.com/
Includes an analysis of Vermeer paintings Great site!
-Royal Collection Trust
http://www.royalcollection.org.uk/
-Grand Ladies Site
http://www.gogmsite.net/
-Paintings Analysis