In these pix we were first in Bonn and then Essen. Bonn had a museum exhibition of Marina Abramovic „The Cleaner“.  She is a world-renowned performance artists. (Wow – super intense and great.) Then we visited the Zeche Zollverein, one of the last big coal & coke mining/smelting plants still standing, now a World Heritage Site. Last year we saw one half. This time we finished the other half. Also, super great stuff.
(The last pix we are in the bottom of a 90 meter chimney.)