The Ruins of St. Paul's (Portuguese: Ruínas de São Paulo, Chinese: 大三巴牌坊) refers to the ruins of a 16th century complex in Macau including of what was originally St. Paul's College and the Cathedral of St. Paul also known as "Mater Dei", a 17th century Portuguese cathedral dedicated to Saint Paul the Apostle. Today, the ruins are one of Macau's most famous landmarks. In 2005, they were officially enlisted as part of the UNESCO World Heritage Site Historic Centre of Macau.
