Battery 519 is one of the largest underground coastal defense bunkers in the United States.
The fort was constructed to defend the Philadelphia shipyards from German U-boat attacks.
Fire-control towers scattered throughout the park were used to triangulate enemy ship coordinates for artillery targeting.
The base was officially named in 1941 after Lieutenant General Nelson A. Miles.
Some original coastal defense guns located at the site were recovered from various military installations across the country for restoration.
The site played a role in the 'Battle of the Atlantic' by monitoring shipping lanes for enemy submarine activity.
Fort Miles Historical Area is a decommissioned coastal defense fortification located within Cape Henlopen State Park, designed to protect the Delaware Bay during World War II. The site features an extensive underground bunker system known as Battery 519, which houses original artillery pieces. Visitors can tour restored gun batteries and military barracks that showcase the fort's strategic role in the Harbor Defenses of the Delaware. The area includes the Battery 519 Museum, which exhibits a collection of historical weapons, uniforms, and military artifacts. The fort's tactical location at the mouth of the Delaware River served as a critical defense point against potential enemy naval activity. Historical re-enactments and seasonal events, occasionally featuring period-specific music, provide insight into 1940s military life. The grounds preserve several concrete fire-control towers that remain prominent landmarks along the coastline. Educational programs highlight the transition of this site from active military installation to a preserved historical landmark.
The top of a fire-control tower provides a panoramic view of the coastline and the fort complex.
Wear comfortable, closed-toe walking shoes as the terrain around the bunkers can be uneven and sandy.
Bring a flashlight if you plan to explore the deeper sections of the bunker interior.
Check the official state park calendar in advance to coordinate your visit with guided tram tours or special living history events.
Attempting to explore the bunker interior without a guide, as many areas are locked or restricted for safety reasons.
Museum buildings and interior tours may have reduced accessibility during winter months; check current park status for seasonal program shifts.
Maintain respectful behavior within the bunker exhibits; do not climb on historical artillery or restricted concrete structures.
