Flickr contains millions of photographs shared by Flickr users under Creative Commons licenses, and is a strong source for contemporary travel, nature, people, and design photographs.
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Several overlays to Flickr offer enhanced search functionality and additional features:
Flickr Creative Commons: Flickr's Creative Commons portal. Browse by license type or choose "Advanced Search" to limit to Creative Commons content.
The Commons by Flickr: Public photo archives, from the New York Public Library, Smithsonian, Library of Congress, Getty Research Institute, and more. The images have no known copyright restrictions.
The following sites are great sources of copyright-free images:
Search for Creative Commons (images, films, musics, etc.)
Library of Congress Prints & Photographs Online: Images from the Library of Congress, now in the public domain.
NGA Images - National Gallery of Art: Includes more than 20,000 open access digital images, available free of charge for download and use
Wikimedia Commons: Historical and contemporary images contributed by participants. Millions of high-resolution images of art, architecture, design, people, historical events, diagrams, maps, and more.
See also Online Archives and Museums
[Image: Hawk Owl, via Public Domain Clip Art]
Clip Art History: Free high-quality public-domain clipart covering all ages of world history. Images may be used for any purpose
Public Domain Clip Art: Large collection of public domain clip art. Images may be used for any purpose and registration is not required