Britannica Image Quest
More than two million rights-cleared images from some 40 image collections. Complete metadata, which includes the source, copyright holder, caption, and keywords, is provided for every image.
The Gender Spectrum Collection: Stock Photos Beyond the Binary
The Gender Spectrum Collection is a stock photo library featuring images of trans and non-binary models that go beyond the clichés. This collection aims to help media better represent members of these communities as people not necessarily defined by their gender identities—people with careers, relationships, talents, passions, and home lives.
Images from the History of Medicine (National Library of Medicine)
Library of Congress American Memory Project
Free and open access to images that document the American experience.
Browse or search through selected images from the Collections of the Office of Imaging and Photographic Services. Included are images from current exhibits, Smithsonian events and historic collections.
Images span science, medicine,social sciences and include manuscripts, paintings, etchings, early photography and advertisements. Every image is being released under the Creative Commons Attribution (CC-BY) license. These images can be used for educational, commercial or personal purposes, with an acknowledgement of the original source (Wellcome Library, London).
A growing database of millions of mostly freely-useable media files.
CDC Public Health Image Library (PHIL)
Created by a Working Group at the Centers for Disease Control and Prevention (CDC), the PHIL offers an organized gateway to CDC's pictures for public health professionals, laboratory scientists, educators and students to use for reference, teaching and presentations.
Science.gov Image Search Select Multimedia to scientific images from the Library of Congress, NASA, NOAA, USDA, USGS and many other sources.
The Why Files: Cool Science Images Find a huge selection of science images here, including images from astronomy, biology, environmental science, health, physical science, and technology. Based at the University of Wisconsin-Madison, The Why Files covers science at all institutions that engage in scientific exploration and discovery.
ARTstor (more information)
More than one million images with contributions from outstanding museums, photographers, libraries, scholars, photo archives, and artists and artists' estates from all over the world.
Museums from around the world by Google
A listing of art museums worldwide
John Johnson Collection: An Archive of Printed Ephemera (includes historical playbills)