Images: Image Collections and Databases

Water Lilies

• Google Images Search for images across the internet

• Digital Public Library of America (DPLA) Discover 52,675,298 images, texts, videos, and sounds from across the United States

• Europeana Search, save and share art, books, films and music from thousands of cultural institutions

• Visual Collections

  Digital images from museums, universities, and private collections.

• Smithsonian - Open Access Collection

  See also: Smithsonian's Archive Collections; Smithsonian's Photo Research; information on rights and reproduction of Smithsonian images

• New York Public Library Digital Gallery

  Over 700,000 from the NYPL's extensive collections.

• OAIster

  Search for images in hundreds of archival collections. Use Advanced search - Format - Visual

• Internet Archive Always check copyright status
• LIFE [magazine] photo archive - hosted by Google

• Search Creative Commons (CC) 
• Wikimedia Commons A collection of more than 1,000,000 freely usable image, video, sound, and 3D model files to which anyone can contribute and reuse. Read more about reusing content outside of Wikimedia Commons. 
• Smithsonian Institute - Open Access Download, share, and reuse millions of the Smithsonian’s images. Access to more than 5 million 2D and 3D digital items including images from across the Smithsonian’s 21 museums, nine research centers, libraries, archives, and the National Zoo.
• pixabay.com Over 5 million high quality stock images, videos and music shared by the community 
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Graphics

• The Noun Project "The world’s most dlverse and extensive icon collection"

Federal Government

• Creative works by federal employees whose creative work (photography, writing, etc.) was done as an employee of the Federal Government are typically in the Public Domain. For example, National Oceanic and Atmospheric Association (NOAA)