http://www.john-leech-archive.org.uk/ John Leech sketch archives 1841 until 1864 from Punch magazine The page states they are long out of copyright and that they are believed to be public domain.
http://beinecke.library.yale.edu/dl_crosscollex/ Yale University's Beinecke Rare Book & Manuscript Library's online collection of digital images. Most will be {PD-art}. 90,000 images from rare books and manuscripts, search by keyword.
http://digitalgallery.nypl.org New York Public Library. Over 500,000 images scanned from books. Including illuminated manuscripts, historical maps, vintage posters, rare prints and photographs, illustrated books, printed ephemera, and more. There is a per-image usage fee even for public domain images.
http://www.oldbookillustrations.com/ Images scanned from old books. States that images on the site are the works of artists who "...have been dead for over seventy years, which makes them part of the public domain in many countries". Searchable by keywords.
America As It Was - a huge resource for vintage postcards in the U.S., organized by state. Any postcard first published in the U.S. before 1978 without an explicit copyright notice is PD. Lots of photos, aerial views, and maps of many U.S. locations.
"The Secret Museum of Mankind" - collection of anthropological photographs published in a 1935 book without copyright. Scanned and released under a CC-NC license, but images should be public domain, at least in the US, since they are faithful reproductions of PD images. (Warning: strong 1930's racist P.O.V.)
Photos of the Great War제1차 세계 대전의 많은 이미지들, 퍼블릭 도메인 이미지를 스캔함. 약간의 주의가 필요합니다. GFDL 라이선스가 적용되었을 수도 있습니다. (requires attribution and link, as does GFDL, requests e-mail notice of usage).
The Heritage of the Great War 약간의 제 1차 세계 대전의 컬러 사진 (likely all PD, since the effort taken to scan/reproduce them probably fails to qualify for being a derivative work).
Note: Accurate photographs of two-dimensional visual artworks lack expressive content and are automatically in the public domain once the painting's copyright has expired (which it has in the US if it was published before 1923). All other copyright notices can safely be ignored.
http://www.bookscanning.com - Scanning of public domain books without destroying them. Great source for non-destructible scanning. (This site provides scanning services of printed Public Domain Works. Customers pay a fee for an editable soft copy of the selected work.)
http://www.theworkofgodschildren.org Collection of high-resolution Roman Catholic images of the Saints and the events in the history of Salvation. All pictures have been released into the public domain.
Photos8.com Large collection of High Resolution photos and wallpapers, Thousands of high quality public domain pictures, easy to search, You may use these images for any purpose, including commercial.
http://www.wpclipart.com - Public Domain clipart optimized for use in word processors. Browsable via site treeview and thumbnail pages. Complete collection also downloadable from ibiblio.
http://www.gutenberg.net/catalog/ - Project Gutenberg: 12,000+ books, only a few illustrated, but the number of illustrated books increases from week to week. There are thousands of PD images available.
http://www.openclipart.org/ - This project is an archive of public domain clip art. The clip art is stored in the W3C scalable vector graphics (SVG) format.
http://www.clker.com/ - Easy to search public domain images, directly usable in openoffice.org
http://pdphoto.org/ - Large collection of mostly public domain photos. Read the license for each picture before use; also, model releases may not have been obtained for all photos.
http://publicdomain.photopress-spain.com/ - Public Domain Spain Photo Gallery. Photo archive containing a collection of free, public domain images and photos of Spain.
http://visualsonline.cancer.gov/ -Great resource for electron microscopy and histological images. Includes general biomedical and science-related images, cancer-specific scientific and patient care-related images, and portraits of directors and staff of the National Cancer Institute.
History of Medicine at the National Library of Medicine. Most but not all of the exhibitions are PD. Clicking on "Metadata" near the bottom of the page will generate a popup window with information that includes Rights usage for each page.
http://www.senate.gov and http://www.house.gov - Congressional sites have a broad variety of public domain images, especially photographs of representatives and senators.
http://www.usa.gov/Topics/Graphics.shtml - A portal to US Government images and photos. "Most of these images and graphics are available for use in the public domain"
everystockphoto.com - Searching over 4.3 million public domain and creative commons photos including wikipedia and NASA. Free user accounts with drag and drop collections, and other features.
PicFindr.com - Searches a hand picked collection of public domain-, free stock photo-, and photo community sites. Includes the ability to search by rights! (whether you need to give credit, ask permission or not)
Spffy.com - Searches one billion stock photos and video, including free images, public domain, creative commons, royalty-free and rights-managed.
