REVERB by Hard Rock Hamburg

Hard Rock's second REVERB property worldwide and its first in Europe, built directly into the Hochbunker St. Pauli — a 1942 Flak tower with 3.5-metre-thick walls that survived because it was too solid to demolish. A €100 million renovation added five new floors and Hamburg's largest public roof garden on top of the original structure, alongside 134 rooms, a concert hall, and several restaurants and bars run independently within the building.

The novelty is the building itself rather than conventional luxury — expect concrete, graffiti art in every room, and a location in the middle of St. Pauli's nightlife rather than a quiet retreat. Not yet visited, but the concept alone earns it a place on the list.

• design hotel
• st pauli
• unique architecture
• rooftop
• music themed