Here are some sites you should see if you are in Jerash
This was the public space in the middle of a Roman city, where people gathered for meetings and political discussions. It is paved with marble stones and has many large columns standing around the circumference. In the fountain are the remains of a fountain.
The hippodrome was my favorite because you get a sense of the past. It is so beautifully preserved that you can imagine yourself sitting there --- watching a chariot game or a gladiator fight just as they did 2000 years ago. According to our tour guide, the Jordanian government still uses the hippodrome today to host chariot races for tourists.
here is the detail of the mosaic floor...
The whole city has many treasures, the Old Christian church has an almost perfect mosaic floor.
The Temple of Atemis
The Street of Columns
Here is a closer look of the Nymphaenum