Introduction to the Moshikou Pass ancient city ruins: Moshikou Pass is a hub project of the Great Wall in the Ming Dynasty. It was built in the 2nd year of Yongle (1404) in the Ming Dynasty. It was where the Moshikou Great Wall defenders were stationed in the Ming Dynasty. The castle is 80 meters long from east to west. It is 13.5 meters wide from north to south and has a masonry structure. There is a south gate. It was originally equipped with an urn and two switches, so it is called "Pun". Nowadays, the walls of the ancient castle have been destroyed, and the ruins of the ruins still exist, making it a good place for tourists to explore and examine the life of the nation.