The third (and last) <PERSON> shuttle that can be visited sits in Germany, at the wonderful Technik Museum in Speyer. It is the fully refurbished OK-GLI, which was used for flight testing. For that purpose it has four jet engines mounted to the rear part, and it has jet fuel tanks in the payload bay. After travelling the world via Russia, Sydney and Bahrain it is now the centerpiece of the best space exhibit in Europe!