Why Mexico’s 16th-century fortress temples were built with massive open-air atriums

Why Mexico’s 16th-century fortress temples were built with massive open-air atriums
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In short: Sixteen monasteries on the slopes of the Popocatépetl volcano served as the architectural blueprint for evangelization across New Spain. These fortress-like complexes utilized vast outdoor atriums and open chapels to accommodate indigenous converts who were unaccustomed to entering enclosed religious structures, blending European design with local ceremonial traditions.

Recognized as a UNESCO World Heritage site in 1994, these sixteen monasteries were established by Franciscan, Dominican, and Augustinian missionaries starting in 1524. They were designed as the cornerstones of colonial town planning, functioning not only as religious centers but also as hospitals, schools, and storage facilities. Because the friars were often outnumbered by hundreds of indigenous converts, they prioritized the construction of large, walled atriums where Mass could be held outdoors. This arrangement mirrored pre-Hispanic rites, which were traditionally performed in open spaces.

The architecture of these sites, often called fortress temples, features thick walls and defensive merlons, reflecting the friars' role as invaders imposing a new faith. A defining feature is the 'capilla abierta' or open chapel, usually facing the atrium, alongside 'capillas posas'—small chapels located in the four corners of the atrium used during processions. To communicate with a largely illiterate population, missionaries adorned these spaces with murals depicting Biblical scenes. These structures also exhibit a complex syncretism, where European styles like Gothic and Renaissance are mixed with indigenous motifs, such as the use of native stones or hidden symbols.

Despite being situated near the active Popocatépetl volcano, the monasteries have remained largely unaffected by volcanic activity, as they were strategically built away from low-lying areas where lava flows. However, they have faced challenges from seismic activity, humidity, and the wear of time. While the Instituto Nacional de Antropología e Historia has invested in restoration, critics argue that funding remains insufficient compared to other major Mexican landmarks. Today, these sites serve as a window into the early colonial period, with some functioning as museums that preserve murals, pre-Hispanic artifacts, and the architectural legacy of an era that reshaped the American continent.

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