Located on Mission Hill, the Ex-Sham Shui Po Service Reservoir is an underground reservoir built in 1904. With granite piers and distinct red brick arches that resemble Roman civil engineering works, the reservoir once held about 9,900 cubic metres of fresh water for residents in Kowloon Tong, Sham Shui Po, and Tai Hang Tung. This reservoir was rediscovered in 2020 and was accorded a Grade I historic status by the Antiquities Advisory Board in 2021. Since then, the government has launched guided individual and group tours, allowing visitors to visit the reservoir and learn more about the history of Hong Kong’s water supply. The tour begins from Berwick Street in Shek Kip Mei, and it takes about 15 minutes to walk to the service reservoir at the top of Mission Hill. In addition to an in-person visit, you can also take a virtual guided tour provided by the Water Supplies Department to experience a 360-degree panoramic view of the reservoir and gain an in-depth understanding of its architecture.