Natural Bridges National Monument was created in 1908.
A national monument is basically the same as a national park... differing mainly in the manner in which it was created. A national monument is created by the President of the United States and a national park is created by legislative action by the U.S. Congress.
Petroglyph National Monument was created in 1990.
Soldiers' National Monument was created in 1869.
Cabrillo National Monument was created in 1913.
Mukuntuweap National Monument was created in 1909.
Dinosaur National Monument was created in 1915.
Bandelier National Monument was created in 1916.
Wupatki National Monument was created in 1924.
National Monument of Scotland was created in 1829.
Tumacacori National Monument was created in 1908.
Sitka National Monument was created in 1910.
Wheeler National Monument was created in 1908.