Tower of Castrobarto de Losa

The Tower of Castrobarto is a medieval defensive tower standing in the village of Castrobarto, within the municipality of Junta de Traslaloma in the province of Burgos. It sits on a hilltop with sweeping views over the surrounding valley — a position that explains its military importance for centuries.

How do you get there?

Castrobarto lies in the Las Merindades region, in the northern part of Burgos province, close to the Magdalena pass that leads into the Mena valley. This is a rural, hilly stretch of countryside, so the easiest way to reach it is by car via the local roads connecting the village to the larger towns of Las Merindades. It's worth having a map handy, since signage in villages this small can be sparse, and the nearest larger tourist hubs are some distance away.

What will you see on site?

Only part of the tower survives today — visitors can see sections of its perimeter walls, though the original layout is still clearly legible: a square floor plan rising through five stories. The facade retains pointed-arch window openings, characteristic of the region's medieval defensive architecture. Above two of the windows, small coats of arms of the Velasco family are still preserved — a trace of the tower's final historical phase, once it passed under that powerful house's control.

The site's history is said to stretch back to the eighth century, though the structure standing today dates from fifteenth-century construction. The tower was built as a watchpost to guard an important trade route that, after crossing the Magdalena pass, entered the Mena valley — its strategic hilltop position was meant to protect the area from raids. Over time ownership passed to the García de Salazar family, one of the most influential in the Merindades region, and due to constant feuding among rival families the tower changed hands several times before finally coming under the dominion of the House of Velasco.

In 1949, the tower was declared a Bien de Interés Cultural (BIC) — Spain's register of cultural heritage sites of special significance — confirming its historical and architectural value.

When should you visit?

Given the village's quiet, low-key character and the absence of built-up tourist infrastructure, spring and summer are the best months for a visit, when the weather favors walking the surrounding hills and daylight hours are longer. The Las Merindades region tends toward fog and damp in autumn and winter, which can make it harder to enjoy the views stretching out from around the tower.

Who is this destination for?

The Tower of Castrobarto suits travelers interested in the history of medieval defensive architecture, as well as anyone drawn to quiet, little-visited corners of Spain. This isn't a site with extensive visitor facilities — it's more of an authentic remnant of the past, appreciated by those looking for a genuine encounter with history without the crowds.

Frequently asked questions

How old is the tower? The earliest references to a structure on this site date to the eighth century, but the building that survives today was constructed in the fifteenth century.

Who owned the tower? Ownership passed through the García de Salazar and Velasco families — traces of the latter are still visible today in the coats of arms above the windows.

Can you go inside the tower? The structure survives only partially, mainly as sections of its perimeter walls, so visits are largely limited to viewing the exterior.

Is the tower a protected heritage site? Yes, it was declared a Bien de Interés Cultural in 1949, Spain's register for sites of special cultural significance.