Perhaps the "best attraction in DC", the Smithsonian's aviation museum charts the "spectacular progress" of "an industry that went from a few hundred feet" of flight "to landing on the moon in 66 years"; the flagship National Mall structure is "packed" with everything from Lindbergh's Spirit of St. Louis to "rockets, spaceships and moon rocks" (no wonder it's "always crowded"), while an "awesome" companion facility near Dulles Airport offers plenty more, including the space shuttle Enterprise, a Concorde and the B-29 bomber Enola Gay.