Aerospace Museum of California 3200 Freedom Park Dr./Watt Ave., off I-80, in McClellan Park, in McClellan, (916) 643-3192. M-Sat 9-5, Sun 10-5. $8, 65+ & 13-17 $6, 6-12 $5. Opened here in 2007 on the former McClellan Air Force Base, this gigantic structure seems a cross between an airport terminal and an airplane hangar. It houses 5 retired military and civilian aircraft inside, and over 30 more outside. Aircraft range from a 1932 one-of-a-kind B-14-B speed wing biplane to a C-53 Sky Trooper that participated in the Normandy invasion. A Morphis ride simulator is available for an extra fee, and the museum participates in the free Young Eagles flight program for kids age 8-17. On open cockpit evenings, visitors can climb inside the planes for a fantastic photo op; admission for everyone then is $5.