Jordan has a very deep and rich history dating back thousands of years. In addition to being at the cross roads of critical trade routes, Jordan also has important religious sites from biblical times. The arid climate has helped to preserve many important archaeological artifacts and ruins.
Some of the earliest inhabitants were the Nebataeans who carved the famous city of Petra out of the sandstone mountains. I spent two days walking through these ruins. It was well over 100 degrees but the interiors of the buildings remain quite cool and comfortable.
The Nabataeans were displaced by the Greeks and then the Romans. There are substantial remains from this period in the sites of Philadelphia, in Amman, and Jerash further north.
It is an amazing feeling to step along abandoned avenues from ancient civilizations. We don't really have anything comparable in the US. Below is a photo of yours truly lost in reflection walking along the cardo maximus of a Roman city.