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The Catedral de San Ildefonso in Mérida, Mexico, is the oldest cathedral on the American mainland, consecrated in 1598 after construction began in 1561. Built with stones from the dismantled Mayan pyramid at the site, it showcases a grand, austere facade in the Spanish Renaissance style, with an impressive interior that includes a high altar and ornate religious art. Located in the heart of Mérida's historic center, this cathedral not only serves as a principal place of worship but also as a cultural monument reflecting the city's colonial past.