The lost photographs of Ansel Adams.
In early 1941, Ansel Adams was commissioned by Harold Ickes, secretary of the Department of Interior, and asked to produce images and large-format murals of landscapes managed by the department.The project was cut short by the start of World War II, and Adams' 200-plus photographs were stored and forgotten.
The Department of Interior website, more about the exhibit.
View the Grand Canyon in full screen. For best viewing go to NPR.