I think this would work better if it were off-center. I also think it would look better in color, black and white, or sepia. The purple just doesn't work for me.
I realise there is more to the scene than the tomb but it seems to be the focal point. As a focal point it is very centered, which makes the image feel very static. A different composition may have helped with the impact more. I do like the transition between dark and light and feel it adds a metaphorical something to the shot.
For me, I wish the subject wasn't dead center in the photograph, and maybe cropped a bit more from the bottom. I do like the color treatment - gives me an old world feel.