Buenos Aires is the capital city of Argentina and its largest city and port, as well as one of the largest cities in Latin America and the world, with a population of approximately 2,800,000 people. Buenos Aires is the site of the Teatro Colon, one of the world's greatest opera houses. There are several symphony orchestras and choral societies belonging to the national and city governments. Buenos Aires also has museums, historical monuments, art galleries, fine arts, crafts, theater, music, literature and poetry. There are public libraries and cultural associations as well as the largest concentration of active theaters in Latin America. There is a world famous zoo and botanical garden, landscaped parks, churches, and houses of worship. The Tango originated in the brothels of the Balvanera district and was not considered respectable until it was adopted by Parisian high society in the 1920s. Until then, Tango schools were only for men. In San Telmo, Sundays find Tango shows on the streets and antique traders in the bazaars around Dorrego Square.