A bit of a double-winner this one. This small museum is a tribute to the production of marzipan, a tradition that goes back to the 18th century and for which Konigsburg was famous. You'll find out about its history, see photos and documents relating to it and some wonderful uses of marzipan including a model of Königsberg Cathedral. The museum is the work of a family firm that took up the tradition and their wares are available for you to buy. The other plus is that the museum is located in the Brandenburg Gate so you get to check off two sights in one.