Lighthouse on Heligoland Dune island (Helgoland Düne). Until the 17th century, the Dune was connected to Heligoland. In 1721 a storm separated the dunes from Heligoland main island. #helgoland #heligoland #helgolanddüne #heligolanddune #nordsee #northsea #helgolandstrand #helgolandleuchtturm #heligolandlighthouse #leuchturm #lighthouse