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 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