Two honourable mentions:
Chris Bladon, because of the contrast between the colourful graffiti and the background

Chris Lock, because he showed us the terrible consequences of war

Third place
Arnie Peterschmidt
Well seen, well composed and certainly urban

Second place
Vijay
Although maybe this one could have done with a bit less processing, this is definitely what urban exploring is about

Winner
Marisa D.L.
Love the feeling in this one; the contrast between the golden glow and the fact that is a desolate place.
Congratulations, Marissa!!

Looking forward to the next challenge.
Maaike