The Museum at Sinsheim is about an hour and a quarter from Frankfurt airport. It is well worth a visit if in the area. It is not just aircraft that can be found there, but a large collection of cars and bikes and even steam engines.
In this gallery can be found some of the aircraft on show there. Like all museums it is very cluttered inside and when trying to take photographs it is extremely hard to get a clear shot. Outside as can be seen, everything is on poles which doesn't make for the best shot.