Two architectural masterpieces by Gaudi, located on either side of Passeig de Gracia. They are outstanding examples of modernist architecture from the early 20th century. Casa Batlló was built in 1906. The building looks like a fantasy world, full of symbols and details inspired by nature. The interior of Casa Batlló continues the theme of nature. The wall is decorated with flowing lines, ornaments and ceilings in the shape of sea shells.