Fort Miles was constructed during World War II as a vital coastal defense installation to deter potential German attacks on key US infrastructure and port cities, such as Philadelphia and Wilmington. Later, it was home to the Top-Secret US Navy SOSUS program. The Fort Miles Museum, located underground in Battery 519, features exhibits relating to coastal defense operations as well as portraying daily life for the over 2,000 soldiers and civilians stationed at Fort Miles during World War II. Tours of Battery 519 are offered year-round (see printable 2022 Calendar of Events for Fort Miles). Learn what the country faced and how Fort Miles planned to defend the United States. Cost for the tours and admission to the museum is $5 per person. For more information, call 302.644.5007. Since 2003, Fort Miles Historical Association and Delaware State Parks have worked in partnership to operate and expand the Museum and surrounding Historical Area.