Old Administration Building - Bryce Canyon National Park - was created in 1933.
Chaco Canyon National Monument was created in 1907.
Somoto Canyon National Monument was created in 2005.
Bryce Canyon National Monument was created in 1923.
Walnut Canyon National Monument was created in 1915.
Grand Canyon Park Operations Building was created in 1929.
Grand Canyon-Parashant National Monument was created in 2000.
Grand Canyon National Park was created on 1919-02-26.
Kings Canyon National Park was created on 1940-03-04.
Leslie Canyon National Wildlife Refuge was created in 1988.
Canyon de Chelly National Monument was created in 1931.
Black Canyon of the Gunnison National Park was created on 1999-10-21.
Hells Canyon National Recreation Area was created on 1975-12-31.