San Juan, Puerto Rico's capital, is the oldest European-founded city in the Americas still under the U.S. flag — a place where 500-year-old fortresses share the coastline with some of the island's best beaches and nightlife.
Quick facts
- Founded: August 8, 1508, by Juan Ponce de León (originally as a settlement called Caparra, relocated to the current islet site in 1521)
- Named for: Saint John the Baptist (San Juan Bautista) — the island itself was originally called "San Juan" and the city "Puerto Rico," with the names swapping over time through common usage
- Location: northern coast of Puerto Rico
- Known for: Old San Juan (a UNESCO World Heritage Site), Castillo San Felipe del Morro, Isla Verde Beach
- Population: ~342,000 (2020 Census), the island's capital and largest city
Construction on Castillo San Felipe del Morro began in 1539, and the fortress protected the city from sea attacks for 400 years. San Juan Bautista Cathedral, dating to 1521, is the oldest church on U.S. soil and the second-oldest in the Western Hemisphere. Because of its remarkably intact Spanish colonial architecture, Old San Juan was named a UNESCO World Heritage Site, and the city marked its 500th anniversary in 2022.
Must-See Historic Sites
- Castillo San Felipe del Morro (El Morro): A 16th-century fortress with sweeping ocean views, one of the most-visited sites in Puerto Rico.
- Casa Blanca: The oldest surviving example of Spanish residential architecture in the U.S., with 14 rooms and period furnishings.
- San Juan Bautista Cathedral: The second-oldest church in the Western Hemisphere.
- Old San Juan's blue cobblestone streets: Made from stones originally used as ship ballast, the compact seven-block old town is walkable in a few hours.
Things to Do
- Wander Old San Juan's colorful colonial streets, stopping for mofongo and local coffee.
- Relax at Isla Verde Beach, one of Puerto Rico's best urban beaches.
- Take a day trip to El Yunque Rainforest or a bioluminescent bay tour.
- Explore local caves, go ziplining, or sail to a nearby island for the day.
Frequently Asked Questions
When was San Juan founded?
San Juan was founded on August 8, 1508, by Juan Ponce de León, originally as the settlement of Caparra before relocating to its current site in 1521.
Why is Old San Juan a UNESCO World Heritage Site?
It's recognized as one of the best-preserved examples of Spanish colonial urban planning and architecture in the Americas.
What is San Juan known for?
Its 500-year-old fortresses (especially El Morro), the colorful streets of Old San Juan, and easy access to beaches, rainforest, and bioluminescent bays.
