The Halligen make up a small patch of land, constantly battling against the natural elements in the heart of the roaring sea. Found on the North Sea coast of Schleswig-Holstein, the Halligen are truly unique. Six of the ten islands are inhabited and are open to visitors. The houses on these tiny islets are built on artificial mounds and, in a storm tide, only these hills rise above the sea while the remainder of the islet is flooded.