Visiting the town of Ajlun with its fortress; one of the best preserved examples of medieval Arab military architecture in the entire Middle East, which was once governed by Saladin. Enjoy the magnificent view into the Jordan Valley. Proceed to visit the Greco-Roman City of Jerash, also known as the City of the thousand columns. Jerash showcases the grandeur of Imperial Rome (and is sometimes referred to as the Pompeii of the East). It is considered one of the largest, and most well preserved sites of Roman architecture in the World outside Italy. As the most pristine Decapolis City (meaning ten cities in Greek) in the modern world, Jerash’s prosperity can be admired in the colonnaded main street and lovely Oval Piazza. Return to Amman. History: In 1596, during the Ottoman Empire, Ajloun was noted in the census as being located in the nahiya of Ajloun in the liwa of Ajloun. It had a population of 313 Muslim households, and 20 Muslim bachelors, in addition to 20 Christian households.