Gaudi's La Pedrera in Barcelona
Casa Mila, also known as La Pedrera, was designed by Antoni Gaudi and built between 1906 and 1912. It was the last private residence designed by the famed architect. Gaudi was inspired by and incorporated nature into its design. If you go don't miss the roof. The chimney funnels were an inspiration to George Lucas for the characters' masks in Star Wars.