Architecture of Barcelona is a style of buildings and designs that are seen in the city of Barcelona, in Spain. It is known for its use of things like curved lines, curves, and shapes in the designs of buildings. Many buildings, like the Sagrada Familia and Casa Batlló, are shaped like curves, with curved lines and shapes in their designs. The roofs of the buildings often have colorful tiles, and most of the buildings have balconies and terraces. The style of architecture in Barcelona is all about creating beautiful, interesting designs, and it is one of the things that makes Barcelona so special and unique!