Depart Amman North to Ajlun Castle, a Saracen fortress which is a mere 16 km from Jerash. The castle is located on the top of a mountain just outside the small city of Ajlun. It is an interesting maze of passages and levels, and offers a wonderful view of the surrounding area, northwestern Jordan, and off into Galilee. Continue to the ruins of Jerash, one of the Middle East's best examples of a Greco-Roman provincial city.  At the entrance of the site, admire Hadrian's Arch, built in 129 AD to mark Emperor Hadrian's visit, and the Hippodrome, a partially restored Roman-era stadium. Once inside, accompanied by a private, local guide, wander the colonnaded streets and discover its most important monuments: Temples, Theaters, Baths, Oval Plaza, Nymphaeum, along with several Byzantine churches dating from the Christian era.  Return to Amman.