Panoramio - Photos of the World
sometimes has closer views than standard Google.
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has been useful.
is super for anything in the public domain: books, documentary films, old radio programs, Hollywood films, things from other countries. Yesterday, I watched several films of Presidents giving speeches. Here's one of Pres. Coolidge, giving a short speech on the White House lawn.
Internet Archive: Free Download: President Coolidge, Taken on the White House Ground
Even though it's full of junk, there are some useful things at youtube. A couple of examples:
Here's some footage of soldiers on Armistice Day.
YouTube - WW1 Armistice Day footage 1918
and a very early recording of Caruso:
YouTube - Enrico Caruso - 1st Ever Recording April 1902