San Juan is the capital and most populous city in Puerto Rico. Founded in 1521 by Juan Ponce de León, who named it City of Puerto Rico (Rich Port). The capital of Puerto Rico is the oldest city under U.S. jurisdiction, but some people argue than St. Augustine, Florida, founded in 1565 is the oldest city in the continental United States.
Look back at San Juan in the 1900s through amazing photos below :
