The San Juan National Historic Site, including three forts and the city walls, reveals hundreds of years of history and war in Puerto Rico. Castillo San Felipe del Morro, or El Morro for short, overlooks the entrance to San Juan Bay. A tour of the stronghold's darkened passages and open spaces is an absolute must if you're in Old San Juan. Admission also includes entrance to Castillo San Cristóbal, the largest fortress in the New World. Spend the day exploring these massive fortifications before enjoying a picturesque walk along the ancient city walls. Check online for hours and more information.
