Rome's architecture over the centuries has greatly developed, especially from the Classical and Imperial Roman styles to modern Fascist architecture. Rome was once the world's main epicentres of classical architecture, developing new forms such as the arch, the dome and the vault. The Romanesque style in the 11th, 12th and 13th centuries was also widely used in Roman architecture, and later the city became one of the main centres of Renaissance and Baroque architecture. Rome's cityscape is also widely Neoclassical and Fascist in style.