Urban and rural trekking: the route of Cartagena's fortifications on foot, from the Fuerte de San Felipe to the Batería

Origins: why Cartagena is walked the way it is walked

Cartagena cannot be understood by looking at it from a bus window. It is understood by walking it, and above all by walking its belt of stone. For more than two centuries, the city was the most coveted stronghold of the Spanish Caribbean, and that entire defensive system —the Castillo San Felipe de Barajas on the cerro de San Lázaro, the wall that embraces the old town, the bastions facing the sea and the batteries watching over the Ciénaga de la Virgen— is still there, above ground, visitable, and free along much of its route. Few cities in South America allow an urban trek of this caliber: ten or twelve kilometers of military history walked on foot, without the need for a bus tour.

The entrances that do charge admission are few and worth being clear about: entry to the Castillo San Felipe de Barajas is around $30,000–$35,000 COP for non-resident adults, while the wall, the outer bastions and the route along Avenida Santander are free to access. The Convento de la Popa and its viewpoint charge a modest entrance fee, subject to change, which is worth confirming on site. On malokal.com you can check the safe map by neighborhood (Locals vs. Foreigners), live holiday schedules and book directly via WhatsApp from each place's listing. Reference ranges are from October 2026.

One clarification worth making before lacing up your boots: forums and blogs circulate stories of secret tunnels, Cold War bunkers and hidden passageways beneath the hill. They do not exist as a visitable attraction. What does exist —and it is a lot— are the documented military tunnels of the Castillo San Felipe, the artillery batteries, the outer forts and the sentry walks along the wall. Here we stick to what is real and verifiable.

Timeline or historical milestones

1536: the cerro de San Lázaro becomes a fortress

Construction of the Castillo San Felipe de Barajas began in 1536 on the cerro de San Lázaro, a strategic promontory that dominates the land and sea approaches to the city. The logic was simple: whoever controlled that height controlled the land entrance. In 1639 came one of the great expansions, and over the following centuries the fort was reinforced again and again until it became the largest military work Spain ever raised in the Americas. Walking today along its ramps and esplanades is walking over layers of engineering that were added generation after generation. One fact that still surprises me: the castle was taken only once in its entire history. Only once. That says quite a lot about the size of the beast it is.

18th century: the wall and the belt of bastions

The defensive system does not end at the castle. The wall surrounding the Centro Histórico, with its bastions —Santo Domingo, San Francisco Javier, Santa Catalina, among others— was consolidated throughout the 18th century and turned Cartagena into a complete walled city. That ring of stone is today the best urban hiking setting on the Colombian coast: it can be walked by day and, with caution, at night, understanding the city as what it was, a fortress facing the sea.

The Ciénaga front: the batteries of the cerro de la Popa

To the north, the city had another vulnerable front: the Ciénaga de la Virgen and the land approaches from the interior. That is why batteries and small forts were raised on the heights of the cerro de la Popa, among them the Batería del Ángel San Rafael, which watched over precisely that corridor. Today they are open-air military ruins, integrated into the hill's landscape, and they form the natural rural extension of this route. Check access conditions and opening hours before going up, because these are heritage-managed sites and they are not always open with the same regularity.

Key figures or events

The Castillo San Felipe de Barajas

It is the obligatory starting point of the trek. The climb from the base, along the avenue that bears its name, is already an honest warm-up: steep ramps, direct sun and an immediate reward when the cannons appear pointing out to sea. Inside, the network of military tunnels is the great attraction: passageways built to move troops and ammunition without being exposed to enemy fire. They are real, documented tunnels, accessible within the castle route; not to be confused with the legends of modern bunkers that do not exist. Notice the vents as you walk: that ventilation system was designed so that air would circulate underground and not become a trap. And do not forget that much of that work was raised by prisoners. Bring a flashlight or use your phone's, because some sections are dark and the floor is uneven. The fort opens during daylight hours and closes relatively early in the afternoon; exact prices and hours change, so check the updated listing before you go.

The Convento de la Popa and its viewpoint

At the top of the cerro de la Popa, the highest point in Cartagena, stands the Convento de la Popa, with its courtyard and its 360-degree viewpoint. From there you can see the entire city: the bay, the wall, the open sea and, on the other side, the Ciénaga de la Virgen. It is the best possible start for a trekking route, because it gives you the complete mental map before you start walking. The climb to the hill can be done on foot along the road that ascends from the pie de la Popa, although the section has traffic and heat; many hikers go up early and come down walking. Check the convent's hours before going up, since it does not open at all hours.

The Batería del Ángel San Rafael

This is the least crowded jewel of the route. The Batería del Ángel San Rafael, in the cerro de la Popa area, is a ruined military structure with open views toward the Ciénaga de la Virgen. Getting there on foot from the convent requires a stretch of trail and dirt road, with dry, thorny vegetation, typical of the area's tropical dry forest. It is not a signposted trail like those in a national park: it is military heritage on an inhabited hill, so you walk with respect, without leaving the paths and without entering private property. Bring enough water, because there are no supply points along the way.

The wall and the Baluarte de Santo Domingo

The urban section of the route descends from the hill toward Avenida Santander and enters the Centro Histórico along the seafront. Avenida Santander is a long, straight walk with a breeze, connecting the Popa and Manga area with the edge of the walled old town. On arrival, the Baluarte de Santo Domingo and the wall complex offer the sentry walk: coral stone, sentry boxes, cannons and the Caribbean in the background. It is free, it is open and it is probably the most photogenic kilometer of the entire walk. Walk early or at sunset; at midday the stone gives back a heat that does not forgive.

Current status: how to do the route today, with a hiker's mindset

The full route, section by section

The logical route, if you want to do it in a single push, is this: start at dawn at the pie de la Popa, climb to the Convento de la Popa for the viewpoint, descend toward the Castillo San Felipe de Barajas and tour its tunnels, go down the avenue toward Avenida Santander, walk along the coast to the Centro Histórico and stroll along the wall to the Baluarte de Santo Domingo. That is between ten and fourteen kilometers depending on detours, with moderate elevation gain but strong sun. If you want the rural extension, do it in reverse or as a separate outing: climb the cerro de la Popa along the dirt road to the Batería del Ángel San Rafael, with views of the Ciénaga de la Virgen.

Best time and weather

Cartagena in October 2026 is still Cartagena: high humidity, vertical sun from mid-morning and possible afternoon rains. The good window is from 5:30 to 9:00 in the morning. Starting at dawn is not only about the heat: it is the only way to walk the wall and the castle without the crowds that arrive with tours in the mid-morning. If you do the rural extension to the hill, get up even earlier, because the dirt road has no shade.

Safety, hydration and footwear

Urban trekking in Cartagena is safe if you move with city logic: do not display your phone or camera on fast roads, walk through busy areas and avoid the cerro de la Popa and Avenida Santander after dusk. Bring at least two liters of water per person, a cap, sunscreen and footwear with grip: the coral stone of the wall and the castle ramps become slippery with humidity. For the rural section, use hiking shoes or light boots, not sandals. And let someone know your route if you go alone to the Batería del Ángel San Rafael.

What to bring and what to avoid

• Water: two liters minimum; there is no supply along the rural section.
• A flashlight or charged phone for the castle tunnels.
• Cash in small bills for entrances and to buy water along the way.
• Avoid midday: between 11:00 and 15:00 the route becomes an endurance test.
• Do not invent shortcuts through private property on the cerro de la Popa; respect the existing paths.

From the Fuerte de San Felipe to the Baluarte de Santo Domingo, and from there to the Batería del Ángel San Rafael, the city shows you why it was impregnable and why today it is better explored with boots than with a bus. Download an offline map of the fortifications and do the route at dawn: you will avoid the heat, the crowds and you will keep the city of stone for yourself alone.