My son and I took an aerospace tour of Southern California a few years back and visited the SR-71 at the Blackbird Airpark in Palmdale, CA.
"[It] is an annex of the Air Force Flight Test Museum at Edwards AFB, was officially dedicated on September 27, 1991. It is the world’s only display of a Lockheed SR-71A together with its predecessor A-12, along with the once ultra-secret D-21 drone and the only remaining U-2 “D” model in the world."It is a great outdoor museum.
We have one here at Eglin AFB Armament Museum.
http://www.afarmamentmuseum.com/
http://www.afarmamentmuseum.com/img/portfolio/aircraft27.jpg