Berlin has a new cultural centre (the Humboldt Forum) and airport (Berlin Brandenburg Airport Willy Brandt) and even major corporations. But the city is no longer growing, while tourism and the club scene have been at rock bottom since the pandemic. What’s next for Berlin? The German capital needs a new story. Something that attracts visitors. Sure, tourists are interested in the Wall, which once separated democratic West from communist East Berlin, and the city’s turbulent history. But Berlin used to be an adventure playground with crumbling charm and amazingly cheap rents. The old buildings have been renovated and instead…