Casa Mila, locally known as La Pedrera, is the last private residence designed by Antoni Gaudi. With an exterior made up of large blocks of limestone, whimsical chimney pots, two huge courtyards, and amazing murals, the design is a testament to Gaudi's boundless creativity. Named a UNESCO World Heritage Site in 1984, explore the 4,500 sqm architectural marvel, including the Whale Attic, Warrior Rooftop, and Tenants' Apartments.