Founded
in 1546, this fabled silver city?s historic town center houses magnificent
churches, abandoned convents and breathtaking Baroque architecture. For
centuries, the city served as the northern frontier of Spain?s New Worldempire. The main attractions are the cathedral (built
between 1707 and 1752), the Plaza de Armas (main
square dating to the 18th century), the Mina el Edem
(an ancient mine) and the Calderon Theater, with its art nouveau facade.