A handsome modern city, Barcelona has broad avenues, bustling traffic, and striking new buildings. The old city, with winding, narrow streets (Roman walls are still visible), has many historic structures, including the imposing Cathedral of Santa Eulalia (13th–15th cent.) with its fine cloisters, the Church of Santa María del Mar, the city hall, and the Lonja or exchange. Also notable is the Church of the Sagrada Familia (begun 1882), designed by Antonio Gaudí. Barcelona is the site of the Fine Arts Museum of Catalonia, the Contemporary Art Museum, museums of Miró's, Picasso's and Dali's works, and a noted opera house.