National Archives Experience - One of the most amazing sites I've ever seen! This site lets you explore the National Archives in a Digital Vault. Way too cool to explain. Just be sure when you find a document you want to use that you click on the Research this article in the ARC to be able to download it. Also, check out the Pathways challenges at the bottom of the page - you can begin one or create your own. http://www.digitalvaults.org/
LIFE Photo Archive hosted by Google Images - "Search millions of photographs from the LIFE photo archive, stretching from the 1750s to today. Most were never published and are now available for the first time through the joint work of LIFE and Google." http://images.google.com/hosted/life
Library of Congress collection on Flickr - "We've been acquiring photos since the mid-1800s when photography was the hot new technology. Because images represent life and the world so vividly, people have long enjoyed exploring our visual collections. Looking at pictures opens new windows to understanding both the past and the present. Favorite photos are often incorporated in books, TV shows, homework assignments, scholarly articles, family histories, and much more. The Prints & Photographs Division takes care of 14 million of the Library's pictures and features more than 1 million through online catalogs. Offering historical photo collections through Flickr is a welcome opportunity to share some of our most popular images more widely."http://www.flickr.com/photos/library_of_congress/
Gateway to Astronaut Photography of Earth - The Gateway to Astronaut Photography of Earth hosts the best and most complete online collection of astronaut photographs of the Earth.
Library of Congress American Memory 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 document the American experience."
Library of Congress collection on Flickr - "We've been acquiring photos since the mid-1800s when photography was the hot new technology. Because images represent life and the world so vividly, people have long enjoyed exploring our visual collections. Looking at pictures opens new windows to understanding both the past and the present. Favorite photos are often incorporated in books, TV shows, homework assignments, scholarly articles, family histories, and much more. The Prints & Photographs Division takes care of 14 million of the Library's pictures and features more than 1 million through online catalogs. Offering historical photo collections through Flickr is a welcome opportunity to share some of our most popular images more widely."
Library of Congress Geography and Map Reading Room - The Geography and Map Division (G&M) has custody of the largest and most comprehensive cartographic collection in the world with collections numbering over 5 million maps, 72,000 atlases, 6,000 reference works, over 500 globes and globe gores, and numerous plastic relief models, and a large number of cartographic materials in other formats, including electronic.
Library of Congress Prints and Photographs Reading Room - Unique in their scope and richness, the prints and photographs collections today number more than 13.7 million images. These include photographs, fine and popular prints and drawings, posters, and architectural and engineering drawings.
LIFE photo archive hosted by Google - "Search millions of photographs from the LIFE photo archive, stretching from the 1750s to today. Most were never published and are now available for the first time through the joint work of LIFE and Google."
NASA Visible Earth – A collection of NASA images and animations of our home planet.
National Archives Experience - One of the most amazing sites I've ever seen. Explore the National Archives in a Digital Vault. Way to cool to explain. Just be sure when you find a document you want to use that you click on the Research this article in the ARC to be able to download it. Also, check out the Pathways challenges at the bottom of the page - you can begin one or create your own.
National Atlas – Check out the Map Maker, Map Layers, Printable Maps and the Dynamic Maps.
National Park Service Digital Image Archives - This site provides links to public domain digital images of many of those sites, including national parks, monuments, historic sites and related areas.
NOAA Photo Library - The NOAA collection includes thousands of weather and space images, hundreds of images of our shores and coastal seas, and thousands of marine species images ranging from the great whales to the most minute plankton.
Smithsonian Images - 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.
University of California Calisphere – especially great are the collections for educators where the primary sources are grouped by collection and then you can drill down by topic.
US Antarctic Program - Welcome to the U.S. Antarctic Program Photo Library. Hundreds of photos are available for you to view and use.
US Fish and Wildlife Services’ Online Digital Media - Welcome to the U.S. Fish and Wildlife Service's online digital media library. Presently, the library system contains the National Image Library--the Service's collection of public domain still photos.
USDA Image Gallery - The Image Gallery is provided as a complimentary source of high quality digital photographs available from the Agricultural Research Service Information Staff.