Lal-lo, in the province of Cagayan, holds a quiet but significant place in Philippine history as the former Nueva Segovia, once the center of Spanish colonial administration and ecclesiastical authority in northern Luzon. Walking through the town today, there is little of the former grandeur that marked it as a colonial capital, yet its legacy remains embedded in one enduring structure, the Saint Dominic de Guzman Parish Church, more commonly known as Lal-lo Church.

The church traces its origins to 1596, when Dominican missionaries established it as part of their early efforts to evangelize the Cagayan Valley. Over time, however, natural forces such as the flooding and shifting of the Cagayan River, along with administrative changes, reshaped the town’s importance. In 1758, the seat of the Diocese of Nueva Segovia was transferred to Vigan, leaving behind a quieter community and a reduced ecclesiastical presence. What remains today is this parish church dedicated to Saint Dominic.

In front of the church stands an important relic of its early history, the Evangelization Cross. Planted by Dominican missionaries more than three centuries ago, this wooden cross symbolized the arrival and spread of Christianity in the area. It was originally placed in front of the church, facing the Cagayan River, and continues to stand there today, now protected within a glass enclosure to preserve it from deterioration.

The exterior of the church is defined by its red brick façade, simple yet imposing, reflecting both its age and the various reconstructions it has undergone. Elements of its design suggest later modifications, particularly after damage from a storm in the nineteenth century. The adjacent bell tower complements the structure, completing the familiar silhouette of a Spanish colonial church. Despite these changes, the building has retained enough of its historical character to be declared a National Historical Landmark in 1939.