Cool!
Lived there ‘63-65, went to a German elementary school while there. Dad worked for Hughes Aircraft back then and was over there teaching the West Germans how to use their new air defense system. The six of us lived in a 1-bed apartment, Welkenrather Strasse 8 (now 78). Mom and Dad converted the dining area to be their Master BR and the four of us kids slept in bunk beds in the one bedroom. Kinda like being on a submarine. We all fit into a VW squareback, too.
That cathedral is one of my favorites. Very eclectic.