In the 1940s, Camp Hood in Killeen, TX built a fake Nazi training village for hand to hand combat. These stills from a Santa Fe Railroad promotional film show a few key areas around the village, including Gestapo headquarters–conveniently identified with the “Gestapo” sign at top.
Remember, if this looks like an Old West town, this is Texas, after all. The sign on the tree says, “Think Dammit.”
The town had a rubble section to simulate bombed out masonry buildings.
As well as wood frame buildings for searching and destroying the ersatz Germans.
The top of Gestapo headquarters had a white swastika flag that could be unfurled when American troops captured it.