The Ruins of St. Paul's is one of the most iconic landmarks in Macau. It is the remains of a 16th-century church that was destroyed by fire in the 19th century. The ruins are a popular tourist attraction, and they are especially beautiful on a rainy day when the crowds are smaller. You can explore the ruins and take in the stunning architecture, which is a blend of Chinese and European styles. There are also several museums and shops in the area where you can learn more about the history of Macau and pick up some souvenirs.