It took a long time to find it. The original Tang and Song neighborhood ruins of Jiangnanguan Street are underground in the IFS outdoor square, and can only be viewed through glass. This is the site of the Tang and Song Dynasty, there are streets, houses, drainage systems, etc., which proves the ancients' superb ability in urban planning, especially the roads are divided into main roads (brick paved roads) and branches (earth branches). It is not clear through the glass.