Boulder Dam

Ansel Easton Adams (February 20, 1902 – April 22, 1984) was an American photographer and environmentalist, best known for his black-and-white photographs of the American West, especially in Yosemite National Park.
 Photograph of the Boulder Dam from Across the Colorado River, 1941
photocredit*http://www.archives.gov/research/ansel-adams/