San Juan is the capital of Puerto Rico, and, at about 318,000 (2019), its largest city. It has one of the best harbors in the Caribbean. The city celebrated its 5th century in 2008 from the founding of Caparra. (In 2021, it will be 500 years since the Caparra settlement was moved to Puerto Rico isle (Old San Juan.)
San Juan is the oldest city under the United States dominion. San Juan is in the north-east of Puerto Rico, and features distinctly century-old architecture, such as Spanish military forts built from the 1540s to 1800s, an active harbor, and a very active economic area in the Hato Rey district. San Juan has magnificent beaches, hotels, plazas, historic sites, museums, etc.