OK.
So , the most famous building in Heidelberg is actually a hotel. It 's the hotel Zum Ritter , which is the only Renaissance building in Heidelberg that was left after  the big destruction and for the Thirty Years War , blah - blah - blah.
Hmm. Does it have nice walls ?
It has wonderful walls. Um - And lots of detail , c and carvings , engravings and so forth ,