SIENA is best known for its cityscape. Its primary sights are gathered in a maze of slim streets and alleys surrounded by the shell shaped piazza, il Campo, one of Italy's greatest squares. The piazza is at the physical and spiritual heart of the city's historic districts. The Duomo which dominated the city skyline and Palazzo Pubblico are two of the finest examples of the city's Italian Gothic architecture. The best of the city's paintings are housed in the Museo Civico and Pinacoteca Nazionale. Weathered sculptures from the cathedral are on show in the outstanding Museo dell'Opera del Duomo.