This bad boy is really close to L'Enfant metro..........

Directions
National Air and Space Museum  
Museum in Washington, D.C., United States of America
The National Air and Space Museum of the Smithsonian Institution holds the largest collection of historic aircraft and spacecraft in the world in 161,145 square feet of exhibition floor space. Wikipedia
Address: 600 Independence Ave SW, Washington, DC 20560
Opened: 1976
Hours: 
Open today · 10:00 am – 5:30 pm
Function: Museum
Phone: (202) 633-2214
Public transit access: L'Enfant Plaza station
Architect: Gyo Obata