I HIGHLY recommend this, in fact if you have to choose between the main museum on the mall and this one, I recommend skipping the mall. The Udvar-Hazy Center is less crowded and has many more aircraft. We spent the entire day there and could have stayed longer.
Here is a small sample of what you can see: (Click to enlarge)
A Sparrowhak that flew from US Navy Dirigibles
A Stearman Trainer used by the Tuskegee Airmen
A Gyrocopter for you Pulp fan out there.
A Hawker Hurricane
The original Enola Gay
A Do-17 Jet Bomber (I think). They have an amazing collection of German WW2 Jet and Rocket planes
You can look down into the hanger wheer they do restorations
And of course the Space Shuttle Discovery
Mrs. Tin Man and I enjoying ourselves
This is just a tiny sample of what they have. Ok, next time I will finally get my actual Historicon pictures up. Until then, good gaming!