Housed within a 51,000-square-foot airport hangar, this spectacular gathering of unique vintage aircraft belongs to local tycoon Paul Allen, who began collecting and restoring rare planes in 1998. The selections run the full length of 20th-century military history, including pieces from the two world wars and other international battles. A favorite plane is the P-51D Mustang from World War II. Tours are self-guided; exhibits help to explain the collection. In summer, try to time your visit for one of the Free Fly Days, when pilots are on-site to fly some of the craft as part of monthly maintenance.