Casa Milà, or La Pedrera is the largest civil building designed by Antoni Gaudi (1852-1926). The apartment block was constructed between 1906 and 1910. The building breaks with traditional architecture by using not a single straight line. The building does not use load-bearing walls, but rest on pillars and arches. The apartments are arranged around two central courtyards, one circular and the other oval shaped. The interior rooms are a mixture of expressionist and Art Nouveau styles and have also no straight line. The top floor, attic and the extraordinary roof are open to visitors. The building is owned by Caixa Catalunya.