There is just too much going on in this composition. While the colors in the arches in the foreground are appealing the stained glass windows in the backdrop have a processed look that is way over saturated in the reds and blues. There is also way too many shapes and patterns that with the arcs and windows that it overwhelms the eye. Helping the viewer to focus what you want them to see as the main subject would help this photo greatly. A vertical crop that mimics and complements the vertical lines/shape of the 'box'/domed arced roof structure would improve the composition greatly. Not only that but a vertical crop would also follow the lines and shape of those stained glass windows.
There's too much cropped out of this for my liking. From the angle you've taken this it's hard to actually tell what I'm looking at. I immediately guessed it was a church or cathedral from the colours and stained glass windows, and your title supports that theory, but apart from that I really don't know what this is!