Kaiserlei is a suburb of Frankfurt and there are bunkers in Frankfurt (as well as elsewhere in Germany) that have been turned into art spaces. It's the kind of

Kaiserlei is a suburb of Frankfurt and there are bunkers in Frankfurt (as well as elsewhere in Germany) that have been turned into art spaces. It's the kind of thing that is plausible, it may even exist under a different name, but is a hallucination. I wonder what would happen if you searched on the German version of Google.