These databases contain images that may be useful for designing sets for a particular time and place.
If you're looking for images of a particular place and time, try searching Google Images with terms like this:
historic photos midwest logging camp
or
historic photos mississippi river steamboat
Remember when you are searching online that there are two ways to spell it: theater and theater. If you search for theat* it will look for both (and theatrical, theaters, etc.)
Google Image Search allows you to filter out images that are free of copyright restrictions. Click "Tools" and choose from the list of Usage Rights.