The Tell Baalbek temple complex, fortified as the town's citadel during the Middle Ages, was constructed from local stone, mostly white granite and a rough white marble. Over the years, it has suffered from the region's numerous earthquakes, the iconoclasm of Christian and Muslim lords, and the reuse of the temples' stone for fortification and other construction. The nearby Qubbat Duris, a 13th-century Muslim shrine on the old road to Damascus, is built out of granite columns, apparently removed from Baalbek. Further, the jointed columns were once banded together with iron; many were gouged open or toppled by the emirs of Damascus to get at the metal. As late as the 16th century, the Temple of Jupiter still held 27 standing columns out of an original 58; there were only nine before the 1759 earthquakes and six today.