More commonly known as "La Pedrera", this building, with its façade evoking the movement of the sea and its fantasy decor, is one of Gaudí's finest achievements. A tour of the roof provides wonderful views of the entire Eixample district, as well as the building’s chimneys and air vents with their unique and somewhat unsettling fairytale shapes. Inside, El Pis provides an insight into life in a noble house in the early 20C.