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Unsplash is a website dedicated to sharing stock photography under the Unsplash license. The website claims over 110,000 contributing photographers and generates more than 11 billion photo impressions per month on their growing library of over 1.5 million photos.

Google provides both basic and advanced image searching for over 1 billion images. Google's Advanced Image Search searching allows you to limit results based on usage rights, by size and quite a bit more.

The World Digital Library (WDL) is a project of the U.S. Library of Congress, carried out with the support of the United Nations Educational, Cultural and Scientific Organization (UNESCO), and in cooperation with libraries, archives, museums, educational institutions, and international organizations from around the world.

The Artstor Digital Library, now part of JSTOR, is a nonprofit resource that provides over 3.3 million digital images in the arts, architecture, humanities, and sciences with an accessible suite of software tools for teaching and research. The community-built collections comprise contributions from international museums, photographers, libraries, scholars, photo archives, and artists and artists' estates.

Provides for searching across a massive number of digital collections located in libraries, archives and museums throughout the United States. Includes georeferences and timelines.

30 Million items from a range of Europe's galleries, archives, libraries and museums.

Flickr provides a search specifically designed to locate works that are offered under the Creative Commons license.

Offers convenient access to search services provided by other independent organizations. Note that selecting different search options within the result list—particularly Image search for Google and Yahoo—may lead to the inclusion of results which are not Creative Commons licensed.

Associated with the Wikipedia, Wikimedia Commons searches the images available in the online Wikipedia encyclopedia. Click on an image to view copyright restrictions.

Photos and videos from the National Oceanographic and Atmospheric Administration's Office of National Marine Sanctuaries.