Most of the images in these collections are attached to generous copyright licensing. (See Creative Commons Licensing.) Though you may not need to ask permission to use them when publishing on the Web for educational purposes, you should cite or attribute these images to their creators unless otherwise notified! To site, use: From source: + URL of image
THE ULTIMATE SITE:
Video
....and for even More...
Photos & Images
Looking for historical images? Check out these sites:
http://www.historicalstockphotos.com/
http://www.flickr.com/photos/library_of_congress/
http://en.wikipedia.org/wiki/Wikipedia:Public_domain_image_resources#History
To find images that can be reused and remixed use Google's Advanced Image search options. To use the usage rights filter option, select "advanced image search" on the main Google Images page. Once in the "advanced image search" page, you will find the usage rights options at the bottom of the page. In the usage rights menu you can select one of four options; "labeled for reuse," "labeled for commercial reuse," "labeled for reuse with modification," or "labeled for commercial reuse with modification."