Introduction to the Palace Square: In the center of the castle is the Palace Square, surrounded by palace buildings from the 16th century. The palace on the east was the living place of the king at that time. There was a room called the "House of Mary of Guise" on the south side. It is a conference hall with luxurious carvings. In addition to being displayed to tourists, these buildings are still used by people in Haibei to hold various ceremonial gatherings.