The Grüner Turm (green tower) and the Limpusturm tower are two of four defence towers that still exist today, which were part of the medieval town fortifications. While the Limpusturm was occasionally used as a prison, the Grüne Turm was home to local artists from the region for a long time.
For the Limpusturm see the Camera Obscura Arnsberg light and media tower.
The green tower with its monocoque construction was the northwestern corner tower of the extended town wall. The adjacent portion of the town fortifications towards the Oleypforte gate can still be easily imagined today.
The distinctive Limpusturm on the Bergstrasse street in Arnsberg is one of the few medieval fortress towers that remain in existence today. Built in the 13th century, it is still a part of the old town wall and at that time was used to defend the town. Later, the tower was used for a long time as a town prison, before it become no longer suitable for this purpose. (It is located in the Bergstrasse street)