San Juan, officially Municipio de la Ciudad Capital San Juan Bautista (Municipality of the Capital City, Saint John the Baptist), is the capital and most populous municipality in Puerto Rico, an unincorporated territory of the United States. As of the 2000 census, it has a population of 658,304 making it the 42nd-largest city under the jurisdiction of the United States. San Juan was founded by Spanish colonists in 1521, who called it Ciudad de Puerto Rico ("Rich Port City"). Puerto Rico's capital is the second oldest European-established city in the Americas, after Santo Domingo, in the Dominican Republic. Several historical buildings are located in San Juan; among the most notable are the city's former defensive forts, Fort San Felipe del Morro and Fort San Cristóbal, and La Fortaleza, the oldest executive mansion in continuous use in the Americas. 

Puerto Rico is an unincorporated U.S. territory, an archipelago that includes the main island of Puerto Rico and a number of smaller islands as Mona, Culebra and Vieques. It's known for its white-sand beaches and coral reefs, popular for snorkeling, diving, surfing and sailing. It's rich history, tropical climate, diverse natural scenery, renowned traditional cuisine and attractive tax incentives make it a popular destination for visitors from around the world!