Good subject for the challenge - round within round, within round. Focus is good, B&W works ok. Two things I don't like: The crop is too tight - I get that you were trying to focus in on the main circle, but you got so tight that the surrounding elements - the edge of the bigger arch, the two little arches below - sort of infringe on the shot. Opening out a little would have, IMO, allowed them to be more in context and improved the overall feel. Also (and I realize that you might not have had much choice), but the shadow really detracts. If you could have shot it at a different time, it might have helped that. But a good shot overall.
Excellent!
I personally wish the lighting were a little better, The shadow from the overhang seems to be distracting. but still rates the high vote!
Good luck.