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Avenida Libertador Bernardo O'Higgins, more frequently called Alameda, is the city's principal thoroughfare. Along with the Pan-American Highway (Avenida Norte Sur) and the Río Mapocho, it forms the wedge that defines the city's historic district. Many of Santiago's most important buildings, including landmarks such as the Iglesia San Francisco, stand along the avenue. Others, like Teatro Municipal, are just steps away.