ARTstor is the place to look for images of fine art, architecture, and more!
To search for images without copyright protection search for your image adding the words site:.gov
Most government published content has no copyright and any image you find you can use safely. Check with agency before proceeding.
Example: butterfly site:.gov
Example: neon site:.gov
Citation in APA
Carr, Franklin (Photographer). (195?). Library [Image], Retrieved June 26, 2010 from: http://digital.boisestate.edu/cdm4/item_viewer.php?CISOROOT=/archives&CISOPTR=1161&CISOBOX=1&REC=19