San Miguel de Allende, Mexico is a city that manages to be both quaint and cosmopolitan at the same time. Once an important stop on the silver route between Zacatecas and Mexico City, its historic center is filled with well-preserved buildings from the 17th and 18th centuries. With its narrow cobblestone streets, leafy courtyards, fine architectural details and sumptuous interiors, San Miguel de Allende is arguably the prettiest town in Mexico.
In 2008 UNESCO recognized San Miguel de Allende and the neighboring Sanctuary of Jesus de Atotonilco as World Heritage of Humanity sites, citing the town’s religious and civil architecture as a demonstration of the evolution of different trends and styles, from Baroque to late 19th century Neo-Gothic. (source)