La Pedrera's rippling stone front hangs from iron beams instead of holding the building up, and no wall inside carries weight either, so a flat can be knocked through at will. The blocks were hoisted up and carved in place on the scaffolding so the curve would run unbroken. Josep Maria Jujol twisted the balcony rails out of scrap iron, no two alike. Gaudí built it between 1906 and 1912, and the city, unimpressed by the raw quarried look, named it after a stone pit.
What you climb for is the roof. The terrace rises and falls in steps, and the chimneys and ventilation towers coming up through it are each twisted into a different shape, so they stand around you like helmeted figures. Below them the attic runs on 270 brick arches, and the long room they carry was once where the tenants dried their washing. The basement was drawn as a garage, among the first under any Barcelona apartment block. It never became only a museum: people still live and work behind those windows.