At the moment, Heligoland is controlled by Germany. Historically, it has also been Danish and British. Ethnically, however, it's Frisian. And now, the best part: when the island was British-controlled, a German bloke on holiday wrote “Deutschland über alles” there.
So the most notorious nationalist anthem in Great German history was written by a tourist on a visit to a British-controlled Frisian spa.
What level of irony is *the world* on?