Introduction to Sanjo Bridge: Sanjo Bridge is a single-eave wooden arch bridge. Although it is a wooden arch bridge like the sister bridge, there are two differences. First, the Sanjo Bridge Gallery is a single-story corridor. Several of the sister bridge corridor houses are elevated as pavilions. Second, the Sanjo Bridge is black and gray while the sister bridge is crimson. Santiao Bridge is located in a deep and uninhabited valley. It is estimated that no one is using it now. However, the ancient roads on both sides seem to remind people that this was once a gathering place for business travelers and mountain people. Only those with "illustrious power" written on them The plaque shows off the past glory to people. How happy it would be to stay here for a few days and enjoy the tranquility of the green mountains and valleys alone.