The old town in Tonghai began to appear in the Western Han Dynasty at the foot of the Xiushan Mountains and the city was formed in the Nanzhao period of the Tang Dynasty. In the Song and Yuan dynasties, castles were built here with adobe, which are called “old county” today. In Hongwu period of the Ming Dynasty, due to the boom of commerce and trade, the old city no longer matched the needs for development and a new city was built with bricks below the old one, which came into the present structure. Since the Han Dynasty, the city between the “old county” and the Xiushan Mountains experienced 2,000 years of ups and downs. In 1987, scattered bronze wares were discovered on a construction site in the county. In the “old county” today, civilian houses of the Ming Dynasty are still preserved.
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