Santiago de Queretaro City is the capital of the State of Queretaro, located 220 km to the north of Mexico City. The historic downtown offers the visitor over 460 years of history and tradition through its aqueduct, temples, mansions and palaces. Queretaro City is characterized for its colonial architecture and its beauty. The city has a 16th-century cathedral and is the site of Querétaro Historical Museum, the Autonomous University of Querétaro (1618), and a technological institute. An Aztec city, Querétaro was conquered by the Spanish in 1531. It is a center for cotton milling, textile manufacturing, and food processing. It is also noted as a trading center for Mexican opals.