Jerash is a fascinating place, I went some years ago as well. Did you see those columns sway? There was a tour guide there doing a demo for his group, he slipped a spoon in between a slit at the base of a column and you can see the other end of the spoon move up and down! I added a video of that to my post but sadly it doesn't play now as it was uploaded via Dlive.
Look forward to your Petra post, something that I still haven't got round to do yet.
It's great that you mentioned it! I completely forgot about the demo. Haha, I was busy chatting with my colleague but I saw the tour guide illustrating it with the column.