Standing guard at Old San Juan’s Eastern Gate is the Castillo de San Crisotbal. Built to protect San Juan against land attacks, the ancient Spanish fort is now part of the San Juan National Historic Site and a great opportunity to see the largest Spanish fortification built in the New World and see some spectacular views of the San Juan Bay and El Morro. The massive structure, which was built in the 18th century to compliment the El Morro fortification which was designed to guard the bay, rises 150 feet above sea level and occupies most of the northeast edge of Old San Juan. Proven to be an effective fortification which helped repel a 1797 land invasion by Sir Ralph Abercrombie, the Castillo de San Cristobal is one of the premier attractions of Old San Juan.
Castillo de San Cristobal is available for exploration from 9:00 a.m. to 6:00 p.m. Self-guided tours and ranger led tours are available. There are many steps and steep ramps covering the 250 acre land parcel, so you must be prepared to walk a good deal.