Every year, millions of visitors walk along the 1 city walls, which have stood above the river for more than two thousand years. The walls have survived wars and floods, but today they are losing a quieter battle against rain, traffic vibration and polluted air.
In 2019, workers 2 a Roman bathhouse under the eastern gate while they were digging a new subway line. The find changed the whole project, and the city now spends millions of yuan a year to 3 the ruins from water and pollution. Guides also ask every visitor to be 4 with the fragile bricks, because one careless touch can carry away a piece of history that took two thousand years to build.