Old San Juan was built by the Spanish in 1533 and still remains on the island to this day. The actual person who founded Puerto Rico was Ponce de León. He was a great Spanish explorer. The reason the Spanish built the fort was as a safe haven to protect their gold on their ships. Puerto Rico was thee first protected anchorage for ships coming from Europe to the New World which had fresh water readily available.
Old San Juan is no longer used for military purposes, but is still an attraction for tourists. The U.S.A now owns Puerto Rico. The U.S took it over in 1898 following the Spanish-American War. The reason the government preserved Old San Juan was because they wanted to teach people the important history of Puerto Rico and the Americas.
On my visit to old San Juan I saw lots of things all these pictures will show what it looks like and what I did there.