The story of St. William’s Cathedral, more commonly known as Laoag Cathedral, began in 1580 when the Augustinian missionaries established a parish in Laoag. The original structure was made of wood and thatch, typical of early mission churches. As the town grew, a more permanent church was planned. The stone foundations of the current structure were laid in 1612, marking the start of what would become a central feature of the city for centuries.

In the town of Sarrat, Ilocos Norte, the Sta. Monica Church stands as one of the most notable landmarks in the province. Known as the largest church in Ilocos Norte, it is especially recognized for the remarkable length of its nave. Built of red bricks in a mix of Earthquake Baroque and Neoclassical architecture, the church complex also includes a convent, a belfry, and a unique brick bridge staircase called the curillo, which connects the church and convent.