Of the many beautiful Roman Catholic churches I've visited so far, four is part of the prestigious list of UNESCO World Heritage Sites (WHS). These are the Church of San Agustín in Paoay, Ilocos Norte; Church of Nuestra Señora de la Asuncion in Sta Maria, Ilocos Sur; The Church of the Immaculate Conception of San Agustin in Intramuros; and Church of Santo Tomas de Villanueva in Miagao, Iloilo.