In fact, this is not a real underground city, but a store, hotel, subway, etc. connected by an underground passage. The coverage is very large, almost half of the old town. It is said that it is because the winter here is too cold, and it is built for the convenience of everyone shopping and entertainment. The underground city is too big, it is estimated that no tourists can visit it. It is also interesting to pick a favorite cafe to sit and see people coming and going.