Specifically it’s Concorde F-BVFB of Air France enjoying retirement next to a Tupolev TU-144 and, best of all, they’re both open for visitors to climb inside. Unfortunately, the keys have been removed to prevent you from firing things up, but there’s still plenty of supersonic style to enjoy once aboard.
If you’re interested in visiting the museum, it's right off autobahn A6 between the cities of Mannheim and Heilbronn. If a rental car isn’t in the cards, you can reach it by walking a few minutes from a train station, as there’s a stop pretty much right there—it’s labeled as Sinsheim Museum/Arena.
Swinging through will set you back €14 per adult, and if you want to see the IMAX movie as well it’s going to be a few more euros—like €19 for the combination ticket.