The 4,000 m2 purist concrete cube is located in the centre of Chur, opposite Villa Planta, the magnificently ornate 18th-century home of the original art museum. The extension, by Barcelona-based Barozzi Veiga, is a contemporary take on the Palladian style of its predecessor. But instead of pomp, radical reduction and repetition reign supreme: the exterior’s sleek, inset relief panels are made up of 4,600 square blocks of cast concrete. It’s Palladian for purists. This minimalist cube is a fine example of how concrete can be made into something that is both strikingly bold and delicate.