Andong Tunnel — Andong Tunnel is located on the north side of Dongyin Island and is an important underground military facility excavated in the past to meet wartime needs.

Andong Tunnel. Andong Tunnel is located on the north side of Dongyin Island and is an important underground military facility excavated in the past to meet wartime needs. Andong Tunnel is located on the north side of Dongyin Island and is an important underground military facility excavated in the past to meet wartime needs. The tunnel winds along the mountainside, with its interior spaces formed by solid rock walls and artificial chisel marks, showcasing the unique engineering techniques and historical traces of the wartime era. Today, Andong Tunnel has been opened as a tourist route, allowing visitors to walk underground and experience firsthand the military culture, the scale of the underground space, and the island's important position in national defense strategy. Address: 連江縣東引鄉連江縣東引鄉安東坑道（位於東引北側區域，依坑道入口標示即可抵達） Hours: 00:00–23:59 Matsu