The fortified town, first established in the 16th century to protect the Royal Route inland, reached its apogee in the 18th century when many of its outstanding religious and civic buildings were built in the style of the Mexican Baroque. Some of these buildings are masterpieces of the style that evolved in the transition from Baroque to neoclassical. Situated 14 km from the town, the Jesuit sanctuary, also dating from the 18th century, is one of the finest examples of Baroque art and architecture in the New Spain. It consists of a large church, and several smaller chapels, all decorated with oil paintings by Rodriguez Juárez and mural paintings by Miguel Antonio Martínez de Pocasangre. Because of its location, San Miguel de Allende acted as a melting pot where Spaniards, Creoles and Amerindians exchanged cultural influences while the Sanctuary of Jesús Nazareno de Atotonilco constitutes an exceptional example of the exchange between European and Latin American cultures. Its architecture and interior decoration testify to the influence of Saint Ignacio de Loyola’s doctrine.

Źródło: World Heritage Convention
http://whc.unesco.org/en/list/1274