Huyen Si church,church in Saigon, Ho Chi Minh city: Located at the junction of Ton That Tung and Nguyen Trai in Ho Chi Minh City's District 1, Huyen Sy Church is one of the four biggest Catholic churches in the city. It is built in the Gothic style of many European cathedrals. Many times daily you will see locals come to Huyen Sy to light incense and votives and pray. The small windows serve a function to keep out as much of the tropical heat as possible.