Located just south of Davis-Monthan Air Force Base, the Pima Air & Space Museum houses one of the largest collections of historic aircraft in the world. On display are more than 275 aircraft, including a mock-up of an X-15A-2 (the world's fastest aircraft), an SR-71 Blackbird, several Russian MIGs, a "Superguppy," and a B-17G "Flying Fortress." Tours are available.
The museum also offers guided tours of Davis-Monthan's AMARG (Arizona Maintenance and Regeneration Group) facility, which goes by the name of the Boneyard. Here, thousands of mothballed military planes are lined up in neat rows under the Arizona sun. Tours, offered Monday through Friday, last about 90 minutes and cost $7 for adults and $4 for children 12 and under.