Travelers can learn about historic battles that took place against the English and Dutch while visiting the restored lighthouse, chapel, and vintage cannons at Castillo San Felipe del Morro (nicknamed El Morro for short). History buffs will also love Castillo San Cristóbal, located near the gate of Old San Juan. While El Morro protected Puerto Rico from sea attacks, Castillo San Cristóbal was designed to stop intruders approaching by land. With grounds stretching some 27 acres (11 hectares), it’s Puerto Rico’s largest fortification site, as well as the biggest built by the Spanish after arrival in the New World.
Guided tours of Old San Juan include visits to the San Juan National Historic Site, plus you can catch views of El Morro while riding around on a Jet Ski tour of the bay.