The Cities/Buildings Database
The Cities/Buildings Database is a collection of digitized images of buildings and cities drawn from across time and throughout the world, available to students, researchers and educators on the web.

Corbis
Purchase pictures over the internet

Getty Images
Getty Images, Inc. is one of the largest international providers of visual content to a diverse range of professional users of images, including advertising and design agencies, magazine, newspaper, broadcasters production companies and the growing area of the web and new media publishers.

Library of Congress
Unique in their scope and richness, the Prints and Photographs collections today number over 13.6 million images. These include photographs, fine and popular prints and drawings, posters, and architectural and engineering drawings. While international in scope, the collections are particularly rich in materials produced in, or documenting the history of, the United States and the lives, interests and achievements of the American people.