Bit by bit, this World War II army outpost on Cape Henlopen is being restored to its appearance in 1942. Tour guides dressed in war-era uniforms take visitors around the low, beige buildings and talk about how this base was built early in the 20th century to defend the Delaware Bay (and thus the cities of Wilmington and Philadelphia) from naval attack. It remained on active duty until 1958. Tours are offered three times a week. There are also lantern tours at dusk and a firepower tour, which focuses on the artillery here. Restoration is ongoing in the 420-foot bunker, which houses the massive 12-inch gun trained on the bay. One of the concrete towers that line Delaware's beaches is open to visitors here. Climb the 100-plus steps of the spiral staircase for birds'-eye views of Lewes and the beach. A visit to the tower is worth the price of admission.