Resting atop the Great Dune and built during World War II to protect the Delaware Bay and River from German warships, Fort Miles was a state-of-the-art coastal defense fortification. While Fort Miles never engaged an enemy target, it did produce some of the most accurate artillerists in the Army. The Navy conducted tests at Fort Miles as part of the first attempt to create a fleet defense missile and also used the fort for its secret Sound Surveillance System to track enemy submarines. Parts of the fort were used as a vacation retreat for military families. Tower 7, one of 11 World War II-era fire control towers, now provides a unique perspective of the park and surrounding area. Today, the historical area operates as a museum, artillery park and oceanfront event space.