Just north of the Old San Juan district, within the San Juan National Historic Site, lies Castillo San Felipe del Morro, a 16th-century citadel, or fortress.
It is a World Heritage-listed site on the northwestern tip of the islet of San Juan – a perfect spot to keep watch over the Atlantic Ocean and protect Old San Juan and the Bay of San Juan from incoming enemies. Its more recent history includes the American military, which occupied the site from 1898 to 1961.
The citadel, surrounded like it is by an expansive green lawn and the dramatic rocky coast, sits on quite a beautiful spot; the imposing fortress walls create an interesting contrast to the sparkling blue sea. When the wind blows, the lawn that connects the citadel to the town is a popular kite-flying spot.