The relaunched Hamburg Bunker is now packed with two restaurants, a five-story Hard Rock Hotel and a newly built pyramid-like rooftop bar and garden from which greenery flows abundantly over the concrete facade. The hotel also has the kind of modern details you’d expect in any self-respecting hip hotel, such as self check-in, smart technology and co-working spaces. On the ground level, there’s the Constant Grind coffee shop and bar, and a Rock Shop for those seeking Hard Rock merch. Ulrich Perrey/dpa/picture alliance/Getty ImagesThe challengeThe Hamburg bunker was one of eight flak towers – above-ground anti-aircraft bunkers which doubled as air raid shelters - which Germany built after British air raids on Berlin in 1940. The history the Hamburg Bunker wears is heavy, but a 76,000-tonne concrete behemoth with walls 2.5 meters thick can’t be easily demolished or ignored.

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Persons: Pauli, Adolf Hitler’s Nazi, Karo, Paul, Frank Rosin, Ulrich Perrey, ” Anita Engels Organizations: CNN, Beatles, Alexa, Shop, Sala, Hamburg, AFP Locations: Pisa, Hamburg, Germany, German, Berlin, Berlin’s, Nazi, Hilldegarden