An artwork called "Convergence: Commute Patterns" is on top of the central subway station here. It's a glass topographic map on the roof that you can walk on.

via StreetComplete 48.0

Attached photo(s):
https://westnordost.de/p/123389.jpg
https://westnordost.de/p/123390.jpg
https://westnordost.de/p/123391.jpg