I enjoy very much visiting the landmarks depicted in coins, and I was very sad to learn that the last remains of the Potsdam Garrison Church were destroyed in 1968. Recently I read about the reconstruction project going on! Hopefully soon I would be able to visit it a post some pictures. You can read about the project and support with donations here: https://garnisonkirche-potsdam.de/en/ And of course, here is the corresponding coin picture