Denmark - Copenhagen - Gemini Residence
When I first saw the MVRDV Gemini residence in Copenhagen I thought it was rather ugly but it's grown on me now and there's no denying it's a very clever idea.
From Wikipedia :"The converted twin silos were raw concrete cylinders, standing 42 metres tall and 25 metres wide. The hollow cores of the silos are used for the infrastructure of the building, stairs, elevators and hallways. The two silos are connected on each floor, giving the building a basic layout resembling the infinity symbol, ∞. The two rotundas are capped with a Texlon roof for natural light, creating a lobby area as tall as the building itself, within which residents and visitors can move up and down.
The apartments have been clipped to the exterior of the silos. The apartments have floor to ceiling windows and balconies along their entire length. At the foot of the silos, the raw concrete has been left uncovered to highlight the origins and history of the structure. This creates a marked horizontal overhang above the quayside esplanade passing below, while the narrow chasm it leaves at ground level creates a passage between dockside and streetside."