The Steven F. Udvar-Hazy Center is the Smithsonian National Air and Space Museum (NASM)'s annex at Washington Dulles International Airport in Chantilly, Virginia. As the NASM continued to collect aircraft, it long ago outgrew its primary facility in crowded downtown Washington, D.C. This center is a companion facility to the National Air and Space Museum.
The Center was made possible by a US$65 million gift in October 1999 to the Smithsonian Institution by Steven F. Udvar-Hazy, an immigrant from Hungary and co-founder of the International Lease Finance Corporation. Construction of the Center required fifteen years of preparationand was built by Hensel Phelps Construction Co.

Opened in December 2003, the Udvar-Hazy Center displays historic aviation and space artifacts, particularly items too large for the National Air and Space Museum's building on the National Mall, including:

the Enola Gay, a Boeing B-29 that dropped the first atomic bomb on Hiroshima, Japan

the Space Shuttle ''Enterprise''

the Gemini VII capsule

an SR-71 Blackbird

an Air France Concorde supersonic jetliner

the Boeing 367-80 jet transport, which was the prototype for the Boeing 707

a Redstone rocket

the Langley Aerodrome A, an attempt at powered flight by Smithsonian Secretary Samuel Pierpont Langley

the Northrop N-1

the only surviving Dornier Do 335 Arrow

the only surviving Heinkel He 219 Owl

the only surviving Arado Ar 234 "Blitz"

one of two surviving Bachem Ba 349 Natter's

the only surviving Nakajima J1N1 Gekko

one of four surviving Northrop P-61 Black Widows

one of two surviving Boeing P-26 Peashooters

a Bede BD-5, a single-seat, homebuilt aircraft that was somewhat popular in the 1970s