U.S. News Insider Tip: Many visitors flock to Old San Juan for nightlife, but you'll find more locals in La Placita de Santurce, a farmer's market by day that hums with music, dancing, dining ...

Spanning 27 acres, Castillo San Cristóbal was built to protect Old San Juan from land attacks. It doesn't receive as many visitors or as much adoration as its sister fortification, El Morro ...