What was America’s first national monument? July 26, 2020 by Pamela Landy The Devil’s Tower, Wyoming, established by President Theodore Roosevelt in 1906, was America’s first national monument. Related Answers How many Madison Square Gardens have there been? What was New York’s Ladies’ Mile? Where is the Dinosaur National Monument? When was Sixth Avenue renamed Avenue of the Americas? How many films did John Ford shoot in Monument Valley, on the Arizona-Utah line?