Which iconic 16th-century citadel in Old San Juan was designed to guard the entrance to the San Juan Bay?
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Castillo San Felipe del Morro, commonly known as El Morro, is a massive six-level fortress built by Spanish engineers. It successfully defended the city against attacks by the English and Dutch. Today, visitors love flying kites on the vast green lawns that stretch out in front of the historic stone walls. Photo: Chad Sparkes from Kissimmee,Florida, United States, Wikimedia Commons, CC BY 2.0.
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Source: Wikipedia (CC BY-SA)
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