I like the composition and the lighting. You chose a good vantage point to get a wonderful view of the entire scene. The people below help show how large the structures are. Good job!
The architecture on the left and the right...as artytoit said..really contributes to the aspect of the old and new, and the green in the background speaks of what lay here before man had a part in any of the artistry that we see before us now. I like your angle and clarity is good as well, the only thing I would like to see is if you have some software to use, if you could lighten this a bit.... It seems slightly dark, IMHO, but other than that it brings a lot to the viewer's eye and for that and many other reasons I'll leave for someone else to point out, I like this a lot :)PJ