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The cathedral of Siena, officially the metropolitan cathedral of Santa Maria Assunta, is the main place of Catholic worship in Siena, in Tuscany, the episcopal seat of the metropolitan archdiocese of Siena-Colle di Val d'Elsa-Montalcino; the building is located in the homonymous square, in the Terzo di Città.Built in Italian Romanesque-Gothic style, it is one of the most significant churches built in this style in Italy.