Amman Citadel gives you a taste of three significant periods in history all on one hill. The ruins will be enough to whet your appetite before venturing out to see the larger sights of, Petra and Jerash. Visiting the citadel after, might be something of an anticlimax. I rocked up straight after a night in the airport Starbucks - early! Being one of the first places I visited in Jordan, I was far from disappointed. Unbeknown to me at the time, I accessed the right side of the site through a side gate and scaled the rather high, broken wall marking the boundary of the Roman section. Looking back, the main entrance was clearly visible and would have cost me 2 JD to enter. Wardens within the compound didn't bat an eyelid, in spite of the fact I was practically the only visitor present at that time. The sight itself combines Byzantine, Roman and Umayyad buildings. A scant amount of the temple and cathedral remain but it was a fitting accomplishment to be able to get all three relics on one panoramic camera shot. Views of the city, spread across several hills and the few imposing columns that remain standing, make the time here easily worthwhile. Arrive early to avoid the midday heat during the summer or shield yourself in the well maintained Umayyad mosque.