I am still currently searching for more sites that cater to public domain and creative commons materials. I have most recently stopped at the NASA Commons site on Flickr. The terms of and conditions of Flickr are available here. The purpose of this site is to give public access to the National Aeronautics and Space Administration’s collection of photographs, historic film, and video. Consequently, this enables NASA’s mission to “pioneer the future in space exploration, scientific discovery and aeronautics research” to flourish. The site was created in November 2009. It has a total of 251 million views and 26.3 K followers. Currently, 3,393 photos have been posted to NASA on The Commons.