1 Best Sight in Theodore Roosevelt National Park, North Dakota

Built in 1866 near the confluence of the Missouri and Yellowstone rivers, this military post was the site of Sitting Bull's surrender in 1881. In summer, you can take a self-guided tour of the restored officers' quarters as well as the unusual, sometimes humorous, tombstones in the soldiers' cemetery. The site grounds and adjoining Missouri-Yellowstone Confluence Interpretive Center are open year-round.