Smithsonian Air & Space Museum Annex (Steven F. Udvar-Hazy Center)
Hours: Open daily from 10:00 a.m. to 5:30 p.m.; closed Christmas Day. From May through September, the center is open until 6:30 p.m. daily (check web site for specific dates).
Admission: Free (but you have to pay for parking).
Parking: Daily parking is available at the Udvar-Hazy Center for $15.
Metrorail: Not accessible by Metro.