Smithsonian National Air and Space Museum

Houses the largest collection of historic aircraft and spacecraft in the world. "One museum, two locations
Discover the wonder of air and space by exploring our two premier locations, where you can see artifacts that took humans to new heights and truly were out of this world.

Free timed-entry passes are required for the Museum in Washington, DC.
Passes are not required for the Steven F. Udvar-Hazy Center in Chantilly, VA."