La Pedrera or Casa Milà was built between 1905 and 1910 and looks as if the architect was sitting at the bottom of the sea when he designed it: a wavy grey stone structure with balconies covered in seaweed like wrought iron tentacles. IN the arched attic you come across an upside-down string-and-bead design hanging from the ceiling, underneath which is a large mirror, and you can see what it looks like the right way up, and suddenly it’s a building shaped like an elaborate tower. The rooftop has a special place in the overall design. It’s peopled with mysterious chimneys shaped like medieval knights, where you can sit at night and listen to live music during summer weekends