Archaeologists using satellite and drone images have discovered a previously hidden monument at the ancient city of Petra in Jordan. The monument is located about 2950 ft (900 m) from the city center and measures 184 x 161 ft (56 x 49 m), roughly the size of six basketball courts. The platform is believed to have been used for ceremonial purposes, and was at one time fronted with columns and a large staircase. Despite being hidden in plain site, it was never recognized from ground level as a monument. After its discovery by satellite imagery, investigations at the site revealed surface pottery dating to the mid-second century BC, the height of Petra's Nabataean civilization.