B/ON-1318 Bunker 4 Bourcy is a World War II-era military bunker located in the province of Luxembourg, Belgium. Situated near the village of Bourcy, this structure forms part of Belgium's wartime defensive network. The bunker's exact historical role and construction details remain to be fully documented, but its presence reflects the strategic importance of the Ardennes region during the war.
Today, it stands as a silent reminder of the military history of the area, attracting interest from heritage enthusiasts and urbex explorers.