The United States Fish and Wildlife Service's online collection of public domain photographs.

Searchable photography collection focusing on the environment in the United States.

The photography collection comprises more than a half million rare and vintage images representing nearly every kind of photographic format and process, and featuring nineteenth-century photographs of Asia, maritime images, early American photographic portraits, as well as architectural and landscape images.

Photography galleries covering topics ranging from air and space, to science, nature, technology, history, people, and places.

Panoramic photographs from the American Memory collection at the Library of Congress.