The Krakow Ghetto was one of the great ghettos of Poland, some 80,000 Jews lived here before the war. Crammed into 30 streets, 320 residential buildings and 3,167 rooms, 4 families per apartment and some living out in the open. They were surrounded by walls that isolated them. All doors and windows facing the "Aryan" side were boarded up, while allowing traffic but followed by four monitored inputs. By grim coincidence, the walls contained panels in the shape of tombstones. Part of the wall has been conserved (and restored) , there are commemorative plaques and pilgrimages of Jews lay flowers there.