berlin, germany. the cube, a modern glass-clad, energy-efficient office building

architecture landmark facade skyscraper building stadium tower headquarters reflection downtown monument city arena memorial bridge blue berlin germany cube modern glass-clad energy-efficient office berlin germany cube modern glass-clad energy-efficient office building washingtonplatz designed danish architects reflection downtown kaleidoscope hauptbahnhof exterior german architectural station central architecture city sky europe landmark urban blue structure mirror glass cityscape view travel tourism capital business innovation futuristic skyscraper tower progress luxury future