The National Cryptologic Museum outside Fort Meade has one or a few Connection Machines, a Cray, and all sorts of other computing and other gear. It's quite a worthwhile tour, IMHO. https://www.nsa.gov/museum/
My former employer, Ab Initio, has a Connection Machine in the basement. (Ab Initio was founded by the same person as Thinking Machines, and many/most of the early employees were from there.)
