when I was in Germany in the summer they had these awesome filled bars, like peppermint, lemon, coffee... all to die for of course. ohoh and don't forget it's a museum, and I went there when I lived in Koeln
http://www.schokoladenmuseum.de/
Was there a few years ago. Very interesting place. Took care of souveniers for my wife!!
Walked over to Paffgen afterwards for a nice lunch.