Fort Miles is open Tuesday - Saturday from 10:00 a.m. to 4:00 p.m. 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. Since 2003, Fort Miles Historical Association and Delaware State Parks have worked in partnership to operate and expand the Museum and surrounding Historical Area. Starting Tuesday, 6/23, guided tours will resume conducted by Delaware State Parks’ historic interpreters. Two tours will be offered daily on an ongoing Tuesday – Saturday schedule. The tour times are 11 AM and 2 PM, with a $5/person tour charge in effect. These will be group tours limited to 10 visitors per tour. Advance reservations are required and can be made by calling 302-644-5007. The Museum will be closed on Sundays and Mondays. Upon re-opening, the Museum will be subject to compliance with Delaware safety regulations, including the requirement that face masks be worn inside the Museum/Battery 519.