what's the largest natl monument ever created?
National monuments are located in 31 states as well as in the District of Columbia, the Virgin Islands, American Samoa, the Minor Outlying Islands, and the Northern Mariana Islands. Arizona, with 18, has the largest number of national monuments, followed by California with 15 and New Mexico with 14. At least 65 national monuments protect places of natural significance, including 12 geological sites, seven marine sites, and five volcanic sites.