A light house is supposed to represent a beacon that guides lost ships home. Lighthouses are usually present along a coast. Cape Henlopen State Park seems to be the perfect candidate for a lighthouse because of its proximity to the sea.
Thus a light flashing from the Cape Henlopen State Park night not seem unusual. However, there was no lighthouse built in the park. Cape Henlopen is home to the Corpse Light. The Corpse Light is a phantom light that lures unsuspecting sailors to their death. The Corpse Light was first spotted 250 years ago. It’s said to be conjured by Britain soldiers who invaded a Native American marriage ceremony. The curse called for the destruction of all European Ships that enter the American shores.
The Corpse Light was supposedly responsible for the sinking of the Devonshireman on December 25, 1655. The ship followed the beaming light of the nonexistent lighthouse to the rocky shore of Cape Henlopen. The ship crashed and killed more than 200 people. People say that the ghost ship reenacts the crash periodically.
The Corpse Light is a symbol of false comfort. It kills under the guise of safety, which makes this one the most haunted places in Delaware.
Sources:
Haunted Delaware: Ghosts and Strange Phenomena of the First State by Patricia A. Martinelli
https://www.ranker.com/list/creepy-delaware-stories-legends/isadora-teich
spoopy stories and urban legends 