National Air and Space Museum, Washington

The National Air and Space Museum of the Smithsonian Institution holds the largest collection of historic aircraft and spacecraft in the world. …

In 2016, the museum saw approximately 7.5 million visitors, making it the second most visited museum in the world … 

… Apollo 11 command module, the Friendship 7 capsule which was flown by John GlennCharles Lindbergh‘s The Spirit of St. Louis, the Bell X-1which broke the sound barrier, and the Wright brothers plane …

It operates an annex, the Steven F. Udvar-Hazy Center, at Dulles International Airport, which opened in 2003 …

Wright Brothers

I took in the IMAX show Journey to Space 3D. A human trip to Mars is explored.

Even better was the Planetarium show Dark Universe. The history of the discovery of dark matter in the context of how the universe began.