In this building Pope Martin V was elected in the year 1417. This was a very important event during the Council of Constance (1414-1418). The name of this building still reminds on this event: Council Building (Konzilgebäude). [German]
Today this former market hall is used as restaurant and event location. So there is a chance to celebrate an anniversary or party in the same hall where a pope was elected about 600 years ago.
On the photo above one can see parts of a historical kitchen garden which was erected on the occasion of an exhibition showing valuable pieces about the Council of Constance.