The Pima museum has one if you happen to be in Tucson AZ.
Back in the day, sentries were posted around the thing and none could approach.
At Pima, you can touch it, I think.
http://www.pimaair.org/collection-detail.php?cid=160
There is also an SR-71 at the Evergreen Museum in McMinnville Oregon. I touched it when I was there a couple weeks ago. The engine is surprisingly small for the power it produces. So is the aircraft, for that matter.
They also have the Spruce Goose, a B-17, and dozens of other aircraft, from MiGs to an Me 109 and (my jaw hit the floor) an Me 262!
He told the story about being up in the nose gear checking on something when a butter bar, who had wondered out on the flight line ,was standing there gawking at the aircraft. He noticed he didn't have his security clearance badge visible, and decided to make an impression.
"Where the hell is your badge?"
"Wh-wh-which one?"
The mechanic held up a foot long wrench and growled, "The right #%$&ing one..."
Ditto that for Seattle's Museum of Flight.
The modern "look" of the thing always amazes me, knowing approx. when it was designed.