This from the national park's Web site: "When Theodore Roosevelt came to Dakota Territory to hunt bison in 1883, he was a skinny, young, spectacled dude from New York. He could not have imagined how his adventure in this remote and unfamiliar place would forever alter the course of the nation. The rugged landscape and strenuous life that TR experienced here would help shape a conservation policy that we still benefit from today."
Theodore Roosevelt National Park is the only national park named after a person. The place inspired Roosevelt when he really needed inspiration. (His life was shattered when his wife and mother both died on the same day in the same house.) I also find the badlands landscape inspiring.