The document summarizes the historical background and architectural features of the Ruins of St. Paul's, a 17th century Jesuit church in Macau. It was built between 1602-1640 and featured a wooden structure and stone facade decorated with carvings. It was abandoned after the Jesuits were expelled in 1762. In 1835, a fire destroyed everything except the stone facade. The facade is now supported by a steel frame. It contains detailed carvings depicting religious symbols and figures. Today it is a famous UNESCO world heritage site that attracts many visitors.