The old town in Tonghai began to appear in West Han Dynasty under the foot of Xiushan Mountain and the city was formed in Nanzhao period of Tang Dynasty. In Song and Yuan dynasties, castles were built here with adobe, which are called “old county” today. In Hongwu period of 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. .
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