San Juan, Puerto Rico, is the capital and largest city of the island. Founded in 1521, it is one of the oldest cities in the United States territory. The city is known for its rich history, vibrant culture, and beautiful architecture, including the famous El Morro fortress. The city features a tropical climate, making it a popular destination for tourists. Visitors can explore the historic Old San Juan district, enjoy local cuisine, and relax on its stunning beaches. San Juan also serves as a hub for commerce and transportation in the Caribbean region.