Antoni Gaudi was a Spanish architect known for developing a unique modernist style characterized by undulating curves and richly textured surfaces. He never made formal plans, instead creating 3D models to design his buildings. His most famous work is the Sagrada Familia basilica in Barcelona, whose construction spanned Gaudi's entire career and remains unfinished. Gaudi sought to blend structural function with ornate decoration inspired by nature, and he is renowned for buildings like Casa Batlló whose dramatic facades seem to come alive through a riot of mosaic tiles.