When you go, visit the castle and find the big barrel. There is a sign "zum grossen fass".
Did you know that the University of Heidelberg used to have a student prison (studentenkarzer), where they condemned students for misbehavior like womanizing, drinking etc? Apparently the locals don't. A taxi driver told us: "Student prison? We have a prison but it's for all the people". After some search a greek student told us where it is. Unfortuanatelly it was closed...
