Well, actually, it's aa stone toilet on which the constipated Martin Luther wrote the Ninety-Five Theses that launched the creation of Europe's Protestant churches.
Scholars had always known that the 16th-century religious leader suffered from acute constipation and spent hours in contemplation on the toilet seat.
Wittenberg (officially named Lutherstadt Wittenberg = 'Luthertown Wittenberg') is situated SE of Hamburh,
but south-west of Berlin :wink: :