The work of Vauban constitutes a major contribution to universal military architecture. It crystallises earlier strategic theories into a rational system of fortifications based on a concrete relationship to territory. Criterion (i): Vauban’s work bears witness to the peak of classic bastioned fortification, typical of western military architecture of modern times. The property guarantees the integrity and authenticity, and reflects the various facets of Vauban’s work. Pooling experience in the areas of restoration and enhancement of the properties within the Network of Major Vauban Sites has already begun.