We’re partial to a bit of concrete at Livingetc, but even we were wowed by the many beautiful ways it’s been used in architecture. Architectonic: Concrete Walls (1958-1980) is a temporary exhibition telling the story of concrete in buildings, running until 15 April at the Atomium in Brussels. It’s a great excuse for a spring city break, but if you can’t make it, click through and enjoy more designs. Sarah, chief sub-editor