Archaeological excavations conducted by the Department of Antiquities and the British School on Colonnaded Street in the late 1950s and early 1960s proved that it was built by the Romans in the second century AD to replace an earlier Nabataean street that followed the winding course of the Wadi Musa, Petra's main river. Currently, the visible portion of Colonnaded Street runs from the Nymphaeum to Temenos Gate. Unfortunately, flash floods badly ruined much of it, leaving only a short stretch of original paving stones. The street probably hosted markets that traded goods such as frankincense and myrrh from southern Arabia and east Africa, as well as semi-precious stones, textiles, and spices from India. The Romans straightened, narrowed, and paved the road, ornamenting it with a double row of columns and constructing a stretch of commercial shops on its south side. Archaeological investigation has shown that this thoroughfare was badly damaged by the devastating earthquake of 363 AD, which toppled its colonnades and commercial buildings. The nine columns presently standing have been re-erected from ancient column drums littering the street.