A landmark of Mayen is the Clemens Church in the city center. In the middle of the pedestrian zone is the church with the leaning, rotated church tower. According to legend, the devil twisted the corkscrew-like tower. But it was a construction error by the carpenters.
Geriatri'x' Fotogallery 
What a fantastic error!
I wish all construction errors were so cool!
That is so cool!