Great work Mark. You've used the haze well and set the whole thing up with the nearly symetrical, dark light foreground. I love the way the foreground falls away to leave a mystery about where the wall goes from there.
What time of the year was this taken and what is the location?
The picture was taken at Simatai, 100 km northeast of Beijing, late afternoon around November 1. Obviously, there were other tourists. Not too many, so it was not too difficult leaving those out..