Marburg is a full-on castle, first built by the Teutonic knights, who seemed to rule in this part of the world for quite some time. They were a religious order of the Roman Catholic Church, but they were also soldiers. Go figure.
Agnes, 'splainin' about the ceilings and walls
Agnes really gets into her historical accounts
After the Russian attacks/bombardment of 1945 (German troops defended within the castle), the church was largely destroyed, and it is the one area of the castle complex that remains unreconstructed. Shown above is the section that largely survived the attacks. Click on the graphic to enlarge it.