The Jiugong Tunnels (九宫隧道, Jiǔgōng Suìdào) are an impressive complex of underground structures located on the scenic Gulangyu Island in Xiamen, Fujian Province, China. The name "Jiugong," which translates to "Nine Palaces," hints at the complex network of interconnected passages. These tunnels are not only an important historical site but also a popular tourist attraction, drawing visitors with their mystery and scale.

Traveler photos:
Originally, the Jiugong Tunnel complex was built for defensive purposes. It stretches under a significant part of Gulangyu Island, cutting through its rocky foundation. The total length of these underground corridors is about 2.5 kilometers, connecting various strategically important points on the island. Creating such an extensive system required significant engineering effort and time.
A walk through the Jiugong Tunnels leaves an unforgettable impression. The height and width of the passages vary: some sections are quite spacious, allowing for free movement, while others become quite narrow, creating a special, slightly mysterious atmosphere. Exploring these underground labyrinths allows you to touch the island's history and appreciate the scale of the work involved in their creation.