Lovely photograph Chris, I really like the flowing lines of the stairs and differing shades of grey throughout, although the sunlight on the floor (in the middle of the photograph) looks a little blown out.
I think you might have been standing in the exact same spot as Frederick Henry Evans in 1903, when he took his "A Sea of Steps" photograph:
http://www.philamuseum.org/collectio...ent/66293.html. I'm not sure which version I prefer :-)
Regards
Nick