This is a challenging image being a night scene, so here is what I did in Photoshop.
The original is a color image but it looks black & white which makes it a bit cold and stark, so I have changed the tones to warm it up.
It still looked a little dark so I lifted the exposure a bit trying not to lose detail from the top of the arch while making it as bright as possible.
Because the arch is square I cropped the image to square keeping the tubular sculpture prominent as its curves contrast so well with the square arch.
Its not as radical as some of the previous (and very good entries) but I think it accentuates the interesting detail.