The building known as the Obispado stands on a hill west of central Monterrey. Bishop Rafael José Verger commissioned the complex in the late eighteenth century as a place of retirement and episcopal residence outside the town. Work began around 1787 on a stone house and chapel dedicated to the Virgin, commonly called the Oratory of the Immaculate Conception. Thick walls, terraces, courtyards, and the domed chapel adapted baroque religious architecture to a commanding site in the arid landscape of northeastern New Spain.

The bishop used the retreat for residence, prayer, and administration, while orchards, water management, kitchens, servants, and outbuildings supported daily life. Its elevated position offered seclusion and a broad view of the valley, qualities that later made it valuable for military purposes. After Verger's death and the political upheavals surrounding Mexican independence, the property passed through periods of institutional and government use. The name Obispado, or bishop's palace, remained attached to the complex even when bishops no longer occupied it continuously.

During the Mexican-American War, the hill became a fortified position in the Battle of Monterrey in September 1846. Mexican troops defended the Obispado and nearby earthworks against United States forces advancing under General Zachary Taylor. After hard fighting on the western approaches, American troops captured the height and turned its guns toward the city. The episode transformed an episcopal retreat into one of Monterrey's best-known battle landmarks and demonstrated how topography could override the original religious and domestic purpose of a building.

The complex saw further military and government use during the unsettled nineteenth century, including periods connected with civil conflict and foreign intervention. Barracks, hospital functions, storage, and defensive occupation altered rooms and finishes. Monterrey expanded around the once-isolated hill as industry and population grew. The Obispado survived because successive authorities found practical uses for it, but those uses also required repairs and modifications that complicated its colonial fabric. Its dome remained a prominent point of orientation above the modern city.

In the twentieth century restoration adapted the building as the Museo Regional de Nuevo León, which opened in the 1950s under Mexico's national heritage authorities. Exhibits place the palace within the Indigenous, colonial, independence, military, and industrial history of the region. Conservation now protects both the late colonial architecture and evidence of later occupation. The Obispado's importance lies in this unusual sequence: a bishop's retreat became a battlefield redoubt, state property, and regional museum. Its hilltop setting still explains each phase, linking spiritual withdrawal, tactical advantage, urban expansion, and public memory.