Devils Tower National Monument is the first National Monument established in the United States in 1906. The monument is an over 800 feet high rock formation located in Wyoming. The "prairie dog" on the medal is a small burrowing rodent which lives in colonies.

Bronze, 44 mm, 50.94 gm
Obverse:
Image of Prairie Dog
PRAIRIE DOG
Reverse:
Image of Devils Tower rock formation
THE FIRST NATIONAL MONUMENT
ESTABLISHED SEPTEMBER 24, 1906
DEVILS TOWER