If you are in the cathedral, ask for the mice at the door. The story behind? Who knows...and in the Domgarten is the "Bleikeller". You can see People who are buried in this cave. There went fully mummified.
You forgot to mention why the Schnoorviertel is called schnoor. Because Schnoor comes from Low German and means cord. This is where ropes and the like used to be made for fishing.