Mount Rushmore National Memorial: South Dakota
Located in the Black Hills of South Dakota, Mount Rushmore's main attraction is, of course, the carving of the four presidents. Within just an hour or two of the memorial, however, are a number of other fascinating National Park Service sites that are sure to enhance your family's visit. Jewel Cave National Monument is the world's second-longest known cave, and Devils Tower National Monument (about 2.5 hours away in Wyoming) has the distinction of being the country's first official national monument.
Source: Ed Menard Ranger