United States
18.4670°, -66.1180°
1949
0.3
Castillo de San Cristóbal is a Spanish fortification built in the 18th century to protect San Juan, Puerto Rico from land-based attacks. The fortress is the largest fortification built by the Spanish in the New World and represents centuries of military architecture evolution. Managed by the National Park Service, it showcases the strategic importance of Puerto Rico in Spanish colonial defense. The monument offers visitors insight into Spanish colonial military engineering and Caribbean history.