One of the smallest museums in Poznań, and certainly the trickiest to find – go through the courtyard, ring the doorbell then climb to the second floor. The series of rooms here are filled with rusty pots, scales and cast iron mortars from the 19th century, and vials dating from as far back as the 17th century. Unless you speak German or Polish you’ll find yourself wandering around in ignorance, though the thick smell of medicine and scattering of pots for mixing potions is liable to bring out the Harry Potter in you. One room has been designed to mimic a 19th century pharmacy - complete with a box for morphine - while another includes over 1,200 rare medical books, a stuffed alligator and an inmates uniform recovered from Mathausen.