The doorways and decorations. The eagle on the left is certainly Moderne. Just now I noticed that the items below his wings are probably stylized fasces. As for the stalactites above, they belong to no style I can name, unless there's a German Expressionist Nosferatu-set style I haven't heard of. It's like a roost for mechanical bats.

The white spots indicate light sockets. They haven't shone in years.