Granite was one of Kinmen's main military assets. It was exploited through the construction of tunnels across much of the islands' land area, providing strong defense and protective shielding from bomb attacks.The Jincheng Civil Defense Tunnel was built in the late 1970s. It's a relatively long underground network that links the Jincheng bus station, Jincheng Post Office, Kinmen Power Company, Water Plant, County Government, Land Bank of Taiwan, etc. It takes about 45 min to walk through.You can learn details about how this tunnel served for war preparedness by going up to the 2nd floor of the Jincheng bus station. There you'll see some introductory exhibits, and staff will help you get on the next guided tour.Guided tour informationAll tours are conducted in Mandarin Chinese. They last about 40 min, and are free.-Each tour allows 5 to 50 participants.-Morning tour times: 10:30, 11:30-Afternoon tour times: 13:30*, 14:30, 15:30, 16:30, 17:30-Evening tour times: 19:00, 20:00**no limited to the number of participants