Ansel Adams, the late American photographer and conservationist, was born on Feb. 20, 1902. His sweeping images of U.S. landscapes helped galvanize the country's nascent conservation movement last century, part of a decades-long effort to expand the national park system and popularize the idea of preserving wilderness.
This legacy warrants some reflection on his birthday — and since a picture is worth a thousand words, here are about 10,000 "words" to honor Adams' historic contributions to nature conservation:
To see more of Adams' indelible imagery from U.S. national parks and monuments — mainly from 1941 to 1942, when he was working under a federal contract — check out these collections kept by the National Archives and the Interior Department.
All photos courtesy U.S. National Archives