The best and most complete online collection of astronaut photographs of the Earth. view entry > | edit entry >
Data and images from NASA's Earth Observatory, where you can monitor regional and global changes on our planet almost as they happen. Here you can explore with NASA scientists the causes and effects… view entry > | edit entry >
Free artistic photos it's a place where you'll find some nice free artistic images that you can use on your blog, website or any other project. Feel free to use them! view entry > | edit entry >
Over 1800 images scanned from out of copyright books owned by the site creator. Well organized, searchable, and easy to download images of different sizes.
From the site:
http://f… view entry > | edit entry >
A collection of over a thousand images of significant historical interest scanned at high-resolution in several sizes. This collection is intended for the media, publishers, and the general public… view entry > | edit entry >
This website of public domain anatomical images from human history was put together by the U.S. National Institute of Health. From their site:
"Historical Anatomies on the Web is a digital project… view entry > | edit entry >
Image*After is a large online free photo collection. You can download and use any image or texture from our site and use it in your own work, either personal or commercial. view entry > | edit entry >
This site is self-described as such:
The intent of this collection is to support the teaching of American political history by providing quick access to uncopyrighted images for inclusion in… view entry > | edit entry >
From the first Punch magazine in 1841 until his death in the 1864 John Leech's cartoons were a major feature. This is an online archive already containing over 600 chosen cartoons of… view entry > | edit entry >
From the LOC site:
American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that… view entry > | edit entry >
These beautiful, historic pictures from the Library represent materials for which the Library is not the intellectual property owner. view entry > | edit entry >
Experience NASA through our great selection of images, video and interactive features. view entry > | edit entry >
The NOAA collection spans centuries of time and much of the natural world from the center of the Earth to the surface of the Sun. Come join NOAA on its journey through the sciences and over the face… view entry > | edit entry >
Over 550,000 images scanned from the holdings of the New York Public Library.
From their site:
Media: Artworks; fine prints; manuscript illuminations; maps; photographs; printed ephemera such as… view entry > | edit entry >
With this site, we hope to provide you with a wide range of illustrations scanned from old books. Most of these pictures are wood engravings or woodcuts, fewer are etchings or copper… view entry > | edit entry >
Hundreds of free public domain images from old postcards, books, and magazines. view entry > | edit entry >
A repository for free public domain photos. view entry > | edit entry >
The leading FREE stock photo site! Whether you just want to browse our huge image gallery or want to share your personal photos with others, this is the site for you!
Browse through the categories… view entry > | edit entry >
Of all documents and materials created in the course of business conducted by the United States Federal government, only 1%-3% are so important for legal or historical reasons that they are kept by us… view entry > | edit entry >
A directory of the U.S. Government's free photo galleries. view entry > | edit entry >
A catalog of NASA images and animations of our home planet. view entry > | edit entry >
A database of more than three million freely usable media files to which anyone can contribute. view entry > | edit entry >
The Government and Geographic Information and Data Services Department at Northwestern University Library has a comprehensive collection of over 300 posters issued by U.S. Federal agencies from the… view entry > | edit entry >
Searchable database of over 90,000 images from Yale's Beinecke Rare Book & Manuscript Library view entry > | edit entry >
This is a master list of places on the web where you can access public domain images. Please add to this list if I've missed any useful sites.