P Line Bunker in Sierra de Aralar

A military bunker located in the Sierra de Aralar, part of Spain's P Line defensive network built during World War II. The P Line (Linea P) was constructed along the Pyrenees to defend Spain's northern border following the Spanish Civil War, when the country was exhausted from years of conflict and faced potential threats from both Allied and Axis powers. This network of fortifications was designed to prevent enemy forces from entering Spanish territory through the mountainous border region.