The Ruins of St. Paul's is a historic site located in Macau, China. Originally built in the 16th century, it served as the cathedral of St. Paul and was a significant symbol of Christianity in Asia. The structure was designed in a Baroque style and featured intricate carvings and a grand facade. In 1835, a fire destroyed most of the building, leaving only the front facade and a few surrounding walls intact. Today, the ruins are a popular tourist attraction and a UNESCO World Heritage site, representing the blend of European and Asian cultures in the region.