Sunset Crater Volcano National Monument, Arizona, USA by Michael in San Diego, California

Sunset Crater National Monument was established by President Herbert Hoover on May 26, 1930, to protect its geologic formations. In 1990 the name was changed to Sunset Crater Volcano National Monument. It occupies 3,040 acres surrounded by Coconino National Forest. Sunset Crater was nearly dynamited in 1929, to create a landslide for the Hollywood movie "Avalanche". Local citizens were outraged and lobbied for its protection. The result was establishment of Sunset Crater National Monument in 1930. "Volcano" was added to the name in 1990.