St. Matthias Church, more commonly known as Tumauini Church, stands quietly in Tumauini, Isabela, its red brick façade immediately setting it apart from most churches in the region. Built in 1753 under the guidance of Dominican missionaries and completed in 1805, the church reflects both the persistence of early evangelization efforts in the Cagayan Valley and the craftsmanship that defined ecclesiastical structures of that period. Constructed almost entirely of baked brick, it carries a warm, textured appearance that becomes more pronounced under natural light.