More commonly known as "La Pedrera", this building, whose façade evokes the movement of the sea, is one of Gaudí's most famed achievements. A guided tour of the rooftops provides matchless views over Barcelona, as well as of the chimneys and air vents with their unique and somewhat unsettling fairy-tale shapes. Inside, the Espai Gaudí illustrates the life and work of the architect, while El Pis provides an insight into life in a nobleman's home in the early 20C.