Stock Photo - 16 June 2021, Schleswig-Holstein, Helgoland: Monique Eichhorn and Sebastian Ebeling, holidaymakers from Berlin, stand at the kitchenette of a so-called Wikkelhouse on the Helgoland dune. The two so-called Wikkelhouses from a manufactory in Amsterdam are fully booked for this season, according to the Helgoland Tourism Service. The Tiny Houses, which can only be booked online and by the week, are also already booked for next year. The tiny houses, whose walls are made of 24 intertwined layers of cardboard at their core, are fully equipped - but there is no water or toilet. (to dpa ""Cardboard in demand: Helgoland wants more Wikkelhouses"") Photo: Marcus Brandt/dpa. - Helgoland/Schleswig-Holstein/Germany