If you guessed that the image for week 5 is a WWII
observation tower in Cape Henlopen Park, you were correct!

With the onset of World War II, the U.S. Army established
a military base at Cape Henlopen in 1941. Bunkers and gun
emplacements were camouflaged among the dunes, and concrete
observation towers were built along the coast to spot
enemy ships. In 1964, the Department of Defense
declared 543 acres of the Cape lands as surplus
property. The State of Delaware accepted
the property and established Cape Henlopen State Park

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Some information used on this page is from http://www.destateparks.com/chsp/chsphistory.asp