Donghai County has several ancient cities of more than one thousand years, of which the Ancient Quyang City is well preserved. The Quyang County was preliminarily built in the West Han Dynasty, about more than two thousand years ago. The city wall is now about more than five meters both in height and in width. The city has clear outlines and takes on the shape of key as a whole. It is 160 meters on the north and east sides and 260 meters long on the west side; there is a gap on the southeast side. The ancient city is built of loess. The holes and hammering traces, which are left during the construction, still come clearly into view now. It has abundant rainfall and used to be hit by floods. Therefore it can be called miracle that the city can be preserved.