In 1941 the National Park Service commissioned noted photographer Ansel Adams to create a photo mural for the Department of the Interior Building in Washington, DC. The theme was to be nature as exemplified and protected in the U.S. National Parks. The project was halted because of World War II and never resumed. That's the opening paragraph from the web page of the...

Records of the National Park Service: Ansel Adams Photographs

If you scroll down the page a bit, you'll find dozens of (approximately) 2 megapixel JPEG scans of Ansel's photographs for this unfinished project.