Our Smithsonian has a slew of historic photos online for perusal and inspiration. This photo isn’t a bad place to start, or you could begin with all the flashy intro stuff here. Beware the visitors’ keywords, although the Smithsonian’s own keywords are inconsistent, too.
Here’s the Washington Post’s take on the photo web site, courtesy of a $500,000 gift (half a million smackers; I’m in the wrong biz!), and more info….