Yongshi and Tiehan Forts are twin fortifications on Xiao Kinmen that are connected by subterranean tunnels. It's just one of many old military installations-turned-tourist attractions that you can find all over Kinmen and its smaller neighbour.
KINMEN FORT
KINMEN FORT WALLS, LIANG SHAN & ZHAISHAN TUNNEL LOOP (金門城/梁山/翟山坑道O型)
This loop in Kinmen's Jincheng Township connects several spots that are more commonly visited on two or four wheels, and of course, while walking, you get to see lots of things you might otherwise miss if you were passing through at speed.
Taiwan Trails and Tales 