It’s hard to miss the Castillo de San Marcos. Perched proudly along the Matanzas Bay in downtown St. Augustine, this centuries-old fortress is more than just a historical site — it’s a living, breathing time capsule. Built by the Spanish in the late 1600s to defend their Florida colony, it’s the oldest masonry fort in the continental U.S. — and yes, it’s still standing strong (coquina stone is seriously impressive).

When you walk through its arched stone corridors and stand on the fortress walls, it’s easy to imagine soldiers watching over the bay, cannons ready, waiting for incoming ships. The panoramic views of the waterfront from the top are worth the visit alone — especially if you catch it on a sunny day or during golden hour.

But what really brings this place to life are the reenactors in full colonial garb, who often lead tours, tell stories, and yes — fire actual cannons (the sound echoes throughout St. Augustine). The kids will be amazed (and let’s be honest, so will the adults). It’s one of those rare spots where history feels fun, not like a lecture — and where everyone walks away with at least one cool photo and a “did-you-know” fact to tell later.

Pro tip: If you’re visiting on a weekend, check the schedule for cannon firings and live demonstrations — they’re a crowd favorite and make the experience feel immersive. And if you’re not in a rush, grab a drink or snack from a local vendor and sit on the grassy bayfront lawn outside the fort. It’s a perfect people-watching and boat-watching combo. The bayfront lawn is also a favorite backdrop for photos — it’s not uncommon to see brides posing for dreamy wedding shots with the fort and water as their backdrop.

Side note: Derek and I love seeing the fort from the water — when you rent a boat, you get a whole new perspective. You’ll spot guests and tourists exploring the grounds, with the historic fort rising behind them and a charming stretch of shops and restaurants lining the shoreline.

Pair a trip to the Castillo with a walk along the St. Augustine seawall, or head across the street to explore the historic district, grab an ice cream from Kilwins, or find a shady spot to relax. It’s also a great starting point for a full day downtown.

And the best part? This iconic landmark is just a 10-minute drive from Saltwater + Sunsets — making it an easy and unforgettable outing during your stay. Whether you’re a history lover, photographer, or just want to experience something unique and local, Castillo de San Marcos belongs on your must-do list.

Ready to explore the past and unwind in the present? Book your stay at Saltwater + Sunsets — your coastal home base for relaxation, history, and all the charm St. Augustine has to offer.