Nestling at the foot of its ruined castle, the pretty medieval town of Kaysersberg is widely known as the birthplace of Nobel Peace Prize winner Albert Schweitzer (1875 1965).
The castle is unsafe and falling to rubble. 
mnli hypothesis: The castle is unsafe and falling to rubble.  premise: Nestling at the foot of its ruined castle, the pretty medieval town of Kaysersberg is widely known as the birthplace of Nobel Peace Prize winner Albert Schweitzer (1875 1965).