There is so much more to Petra than I had realized, and I didn't begin to see it all in the one day that I had. (Maybe that's a good thing -- I can't imagine how many pictures I would have taken if I'd had, say, a week. I'd be going through them for the rest of my life.)
The structures in the background, for example -- those are the Royal Tombs, and I walked past them and took a few pictures, and had a soda at a nearby cafe so I could look at them, but I didn't get any closer than this. There are many more wonders that I never even saw.
Yet one more place I can't really cross off the list because I really want to go back.