Iron FortThe Iron Fort is a former fort in Ren'ai Village, Nangan Township, Lienchiang County, Taiwan.HistoryThe fort was originally constructed as the training base for the amphibious forces.ArchitectureThe fort was constructed at the southern coast of Nangan Island on an offshore rock. The middle of the rock was excavated to form a tunnel which houses various military equipment and accommodation facilities. The granite building is painted with camouflage paint.