Frommer's Review
Called "El Morro," this fort stands on a rocky promontory dominating the entrance to San Juan Bay. Constructed in 1540, the original fort was a round tower, which can still be seen deep inside the lower levels of the castle. More walls and cannon-firing positions were added, and by 1787, the fortification attained the complex design you see today. This fortress was attacked repeatedly by both the English and the Dutch.
The U.S. National Park Service protects the fortifications of Old San Juan, which have been declared a World Heritage Site by the United Nations. With some of the most dramatic views in the Caribbean, you'll find El Morro an intriguing labyrinth of dungeons, barracks, vaults, lookouts, and ramps. Historical and background information is provided in a video in English and Spanish. The nearest parking is the underground facility beneath the Quincentennial Plaza at the Ballajá barracks (Cuartel de Ballajá) on Calle Norzagaray. Sometimes park rangers lead hour-long tours for free, although you can also visit on your own. With the purchase of a ticket here, you don't have to pay the admission for Fort San Cristóbal if you visit during the same day.
Before going into the citadel, you can visit the new $2 million San Juan National Historic Site (tel. 787/729-6960), which is open daily from 9am to 5pm, charging $3 for adults, $2 for seniors, and $1 for children 13 to 17 (free for 12 and under). The center is connected via two tunnels to Fort San Cristóbal, and was created from a strategic military base used in World War II. Visitors view a 12-minute film about the fortifications. A photo exhibit, a gift shop, and other exhibits are of interest.
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