Museo Davia Bargellini is a small Bologna museum in a 17th-century palazzo, with a collection that feels more like a cabinet of curiosities than a formal gallery. Religious art, antique keys, door hardware, a marionette theatre, and an 18th-century gilded carriage all share the rooms.
It is a good short stop if you want something more eccentric than Bologna's major churches and civic museums, especially while walking east of the Two Towers.