The sole remaining of two prototypes lives in Monino, about 25 miles outside of Moscow, at the Central Air Force Museum. The CAFM's huge collection includes exhibits like the largest helicopter ever built, exotic supersonic bombers and airliners, weird experimental engines and my favorite of all, a Tupolev Bear, whose contra-rotating props have tip speeds exceeding the sound barrier, making it the loudest turboprop in the world.
Monino has to be one of the best air museums on earth, and is pretty much universally agreed to be the best in Russia. It's a place high on my 'Geeky Shit I Must See Before I Die' list.
Image source - Official Russian language CAFM website