Castasegna is a picturesque border village in Val Bregaglia, a mountain valley between the Maloja Pass and Chiavenna. A stone’s throw from the Italian border, a polygonal, pebble-coloured concrete tower stands high above the main road, exuding an unexpected sense of urbanity. It sits in the orchard of Villa Garbald, a stately 19th-century country house designed by Gottfried Semper. Inspired by the Lombard bird-hunting towers known as ‘roccoli’, Quintus Miller and Paola Maranta designed the Roccolo Tower as a contemporary companion to the Semper building, which they had also renovated. The pioneering reinterpretation of Bregaglia architecture has earned the Basel office international attention and recognition.