Stronghold 26, located at the southeast corner of Nangan Island, was once an important coastal defense stronghold. It is adjacent to the southern end of the Nangan Airport runway, facing Jieshou Bay, offering a vast sea view and excellent visibility. After walking along the path next to the airport, through the forest and secluded road, the view suddenly opens up, revealing a stunning sight. Most of the buildings here are hidden underground or half-buried, reflecting the low-key and mysterious nature typical of military facilities.