Ironically nicknamed La Pedrera (“the stone quarry”) by locals when it was built in the early part of the 20th century, the Casa Milà has become one of the most popular tourist attractions in Barcelona. The second-to-last building created by the controversial Gaudí, this immense building, designed to be a private home, hides behind an undulating limestone façade, typical of the Catalan architect. Both the inside and outside of the building are organic, packed with thousands of details with dreamlike symbols. One of the apartments, the hall, the inner courtyard, the huge terrace and a small museum are all open to the public.