The area known as the Citadel sits on the highest hill in Amman, Jebel al-Qala’a (about 850m above sea level), and is the site of ancient Rabbath-Ammon. Occupied since the Bronze Age, it's surrounded by a 1700m-long wall, which were rebuilt many times during the Bronze and Iron Ages, as well as the Roman, Byzantine and Umayyad periods. There's plenty to see, but the Citadel's most striking sights are the Temple of Hercules and the Ummayad Palace.