The restored tower was one of 15 built in 1942 to defend against naval invasion of Delaware Bay, including chemical, gunpowder, and shipbuilding facilities in Wilmington and Philadelphia. Near the front entrance a map of the tower system and nearby gun installations illustrates how the towers offered a method of triangulating naval targets almost 20 miles away. We were told at the door that the the admission fee was $12 per adult, not $6 as advertised, so we left the tower unclimbed.
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