Loads of snaps here - none of which show how bloody knackering this thing was to climb!
The part we went up appeared to be the first bit of wall on the road out of Beijing [Edit: later discovered it is called JuYongGuan Pass], so it was very busy. We arrived at 8am, and it got a LOT busier as the day went on, so we were lucky really. It was as steep a climb as I have ever made on stairs - some steps were almost up to my knee, where others were no higher than my foot. A real mix.
I reckon I ascended about 1,380 feet in all - it took just under an hour, and about 1½ litres of water!