Well, that is one. A somewhat small example though

But besides this tiny one, there are still 15 big ones standing all over the city.
This one is about 15 mins walking distance away. 300 people died in here when an air mine exploded nearby while the gates were still open:

This one I passed daily on my way to the universitiy years ago:

And this one looks quite interesting:

(none of these pics were taken by me)