I must admit the hospital level is one of the coolest levels!
It's such a pitty the game has so much bugs because here the engine proves to be really really good.
It sets the pace for next gen shooters. I loved the level, and the boss fight there was unforgettable.

I really like the russian levels, it looked AMAZING
I think there was a reference from the fallen fighters square building too, it looked kinda similar with the bar and the stairs going round.