The ancient castle of Siyong in Switzerland is not only an important military fortress, but also the residence of the medieval princes and nobles. In the 20th century, it was renovated as a museum of history, culture and military affairs. With a brilliant history and rich collection, Xiyong Castle attracts tourists from all over the world. The castle is located on a stone island on the shore of Lake Lehmann in Montreux, Switzerland. Originally owned by the Siyong religion, the castle became the property of Count Sava of France after the 12th century. During the reign of Sawapeter II, a large-scale expansion project was carried out to make the castle take shape today. The first courtyard was surrounded by military garrisons and gates, and the second courtyard was surrounded by the residence of the castle owners, as well as warehouses and dungeons. The third courtyard has the main hall of the castle, the duke's bedroom, the chapel, the judicial hall and the clerical hall. Courtyard No. 4 is also called "Wall Courtyard". All the buildings here are built to defend the castle and control the ancient road. The moat of the castle is a natural trench, widened by dredging in the 13th century, and built three semi-circular towers around the outer wall. The ancient bridge across the moat was originally a wooden suspension bridge, which was replaced by an iron beam and wooden slab bridge in the 18th century. One