Devil's Tower... the first National Monument
Devil's Tower National Monument Visitor's Center

President Theodore Roosevelt proclaimed Devil’s Tower a national monument on September 24, 1906.

President Roosevelt acted under the authority of the Antiquities Act of 1906 which declared, “that the President of the United States is hereby authorized, in his discretion, to declare by public proclamation historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest that are situated upon the lands owned or controlled by the Government of the United States to be national monuments...”