Astronomy Picture of the Day

Some of these pictures are Public Domain but many are not.

• https://apod.nasa.gov/apod/astropix.html

British Library

Over a million Public Domain pictures.

• https://www.flickr.com/photos/britishlibrary/
• https://qz.com/462565/how-to-access-a-million-stunning-copyright-free-antique-illustrations-released-by-the-british-library/

Defense photos

These works are probably in the Public Domain but it is not certain.

• https://www.defense.gov/observe/photo-gallery/

Defense Visual Information Distribution Service

The Defense Visual Information Distribution Service (DVIDS) provides public domain audio, photos, and videos related to the United States military. Quoting from the DVIDS website:

All DVIDS Media is considered public domain and is free to use unless otherwise specified.

• https://www.dvidshub.net/
• https://www.dvidshub.net/unit
• https://www.dvidshub.net/branch/Space+Force

Library of Congress

Quoting from the website:

The Library believes that this content is either in the public domain, has no known copyright, or has been cleared by the copyright owner for public use.

• https://www.loc.gov/free-to-use/
• https://www.loc.gov/free-to-use/public-domain-films-from-the-national-film-registry

National Park Service

• https://www.nps.gov/media/multimedia-search.htm

Prelinger Archives

When you click on an item for details, the site clearly shows the copyright status of the video. Most or all of the items in Prelinger Archives are Public Domain.

• https://archive.org/details/prelinger

Yellowstone National Park Photos, Sounds, Videos

• https://www.flickr.com/photos/yellowstonenps/sets/
• https://www.nps.gov/yell/learn/photosmultimedia/photogallery.htm
• https://www.nps.gov/yell/learn/photosmultimedia/sounds.htm
• https://www.nps.gov/yell/learn/photosmultimedia/soundlibrary.htm
• https://www.nps.gov/yell/learn/photosmultimedia/videos.htm
• https://www.nps.gov/yell/learn/photosmultimedia/videolibrary.htm (only public domain)

Wikipedia list of Public Domain sites

• https://en.wikipedia.org/wiki/Wikipedia:Public_domain_image_resources

Almost all works before 1923 are in the Public Domain:

• https://copyright.cornell.edu/publicdomain
• http://www.infotoday.com/searcher/sep12/Hirtle--When-Is-1923-Going-to-Arrive-and-Other-Complications-of-the-U.S.-Public-Domain.shtml

Most works published in the U.S. between 1922 and 1963 are in the Public Domain

Works created by the U.S. Government are in the Public Domain:

• https://www.usa.gov/government-works