An interactive history of the Wienermobile
http://www.oscar-mayer.com/wienermobile/history.html
Photographs trace the evolution of the Oscar Meyer Wienermobile from 1936 to the present.

CIA and Assassinations: The Guatemala 1954 Documents
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB4/
Documents relating to the CIA's support of the 1954 coup against President Arbenz.

Eisenhower Center
http://history.cc.ukans.edu/heritage/abilene/ikectr.html

Levittown: Documents of an Ideal American Suburb
http://www.uic.edu/~pbhales/Levittown.html
Photographs of the quintessential postwar suburb.

NASA Historical Archive for Manned Missions
http://www.ksc.nasa.gov/history/history.html
Hundreds of photographs, and bare-bones descriptions of each mission. More expressive descriptions of Apollo 11 and 13.

The Avalon Project: 20th Century Documents
http://www.yale.edu/lawweb/avalon/20th.htm
Diplomatic documents, with emphases on World War II, the Cold War, and Palestine.

The Literature & Culture of the American 1950s
http://www.english.upenn.edu/~afilreis/50s/home.html
Documents from the 1950s, with particular emphasis on McCarthyism.

Urban Renewal and the Changing Face of Lancaster
http://www.fandm.edu/Departments/AmericanStudies/faculty/schuyler/urbanrenewal/exhibittitle.html