Located just off the point of Cape Henlopen, the Harbor Refuge Lighthouse (or outer breakwater) is a working unmanned light maintained by the U.S. lighthouseharborrefugeCoast Guard. It is the only lighthouse still operating off the coastline of southern Delaware. Actually more of a marker, it is used by pilot boats that ferry supplies out to large ships.

The white, steel 75-foot lighthouse was built in 1901 as the final phase of the outer breakwater construction project which began in 1896.