Castillo San Felipe de Barajas: visiting the largest Spanish fortress in the Americas
Most fortresses defend a city. San Felipe Castle was built to make sure Cartagena never needed defending twice.
What it is
Castillo San Felipe de Barajas sits on San Lázaro Hill, in the Pie de la Popa / Pie del Cerro district, just outside the walled city. It’s the largest military fortress Spain ever built in the Americas, and unlike most colonial ruins, it’s still structurally whole enough to walk through top to bottom.
Construction began in 1654 under Governor Pedro Zapata de Mendoza, who named it in honour of King Philip IV. It stayed a modest fort for a century, until engineer Antonio de Arévalo, the same engineer who sealed off the Bocagrande channel and finished Las Bóvedas in the walled city, expanded it in the 18th century to cover the entire hill. That expansion is what turned it from a fort into the fortress that stands today.
Why it was built this way
Two design choices explain why San Felipe was never successfully taken:
A triangular, tiered structure. The fortress was laid out so that no matter where an attacking force approached from, defenders had crossfire lines with zero blind spots.
An acoustic tunnel network. Underneath the fortress, San Felipe has an intricate labyrinth of tunnels engineered to amplify sound, specifically, the footsteps of anyone trying to infiltrate underground. Defenders could hear enemy movement through solid rock before it ever reached the surface. It’s one of the more unusual pieces of military engineering from the colonial period, and it’s still walkable today.
The moment that made it famous
The fortress’s biggest test came in 1741, during the War of Jenkins’ Ear, when British Admiral Edward Vernon attacked Cartagena with a fleet of 186 ships and more than 23,000 men. That’s the same siege Spanish commander Blas de Lezo repelled with a fraction of the manpower, and San Felipe’s defences were a core part of why the attack collapsed. The full story of that siege is covered in the Cartagena history guide.
Visiting details
- Location: Pie de la Popa, roughly a 15-20 minute walk from Getsemaní, or a short taxi ride.
- Hours: Daily, 7:00 or 8:00am to 6:00pm.
- Admission (2026): Approximately £5.50-6 for international visitors, with an optional audio guide around £1.90.
- Best time to go: Morning. The stone holds heat, and there’s not much shade once you’re on the upper ramparts.
The tunnel network is the one part of the visit that rewards a guide over a solo wander, it’s easy to walk past details (drainage systems, listening posts) that don’t mean much without context. A guided tour through San Felipe is a standard stop on most Cartagena city excursions, usually bundled with a pass through Bocagrande, Castillogrande, and Manga on the way there.
And of course you can visit San Felipe Castle as part of a guided Cartagena tour by choosing one of Exoticca’s Colombia trip packages.
