Seven miles east of Rapid City, off I-90, exit 67, the South Dakota Air and Space Museum (235 Main Gate Rd., 605/385-5189, www.sdairandspacemuseum.com, summer daily 8:30 a.m.–6 p.m., winter daily 8 a.m.–4:30 p.m., free) is located just outside the main gate to Ellsworth Air Force Base. This is a site for fans of military aviation.

There are over 25 aircraft displays ranging from World War II bombers to the contemporary B-1B Lancer. Some of the planes are displayed inside the hangar, but most are outside on the grounds. (In January and February, only the outside grounds are open and the museum’s indoor hangars and gift shop are closed.)

Since the museum is located outside of Ellsworth Air Force Base, a military or other ID is not required for entry. A bus tour (mid-May–mid-Sept, adult $7, child $4), however, enters the grounds of the base, so all visitors over the age of 18 must bring valid identification in order to clear a security checkpoint. The bus tour takes about 50 minutes and includes a tour of the base and a visit to a Minuteman II training launch facility.