I've been there, it's Kino.
The nazis built ruins all over Europe to try and connect Aryan people to their history, many were abandoned on purpose specifically to preserve the Aryan spirit of the reich should fall, like Roman ruins.

The muchkapla is actually a bunker site, the cement superstructure is just the visual centre and was used in surveying.

We know where most of the nazi Kino is in Europe, we still use these sites, and their location is often known only to locals, nazis, or local nazis. But if you're an Aryan don't be surprised if you just find them, they're usually where you would expect them to be, because they're tied to the land