The territory of Bizkaia conceals remnants of its industrial past in many unexpected places, with the calcination kilns of the Catalina mine in Sopuerta serving as a perfect example. These gigantic structures, resembling towers or volcanoes amidst the mountains, can transform a simple family stroll into a small adventure.

These kilns operated between the 1950s and 1970s to calcine iron ore, forming part of an old mining complex now disused. However, the site is notable for its considerable fragility. Experts warn that the complex is in "quite poor condition" and is listed on the red list of heritage, urging visitors to exercise caution.

The visit extends beyond mere "industrial archaeology." Very close to the imposing chimneys are the hermitage of Santa Lucía de Labarrieta and a nearby lake, which add further charm to the route. This combination makes the journey a simple and unique plan, ideal for those seeking to explore uncrowded corners not "prepared" for conventional tourism.

Although not a place designed for a full day out, it is recommended as an interesting family excursion. For those keen to discover it, the suggested route begins by parking in the motorhome area of the Los Castaños neighborhood, from where the walk starts towards this "peculiar" destination in the Encartaciones.

The Catalina Mine is one of the most representative examples of the industrial past linked to iron extraction, which fueled the economic development of the area during the 19th and 20th centuries. Today, the remains of mining infrastructure are part of the historical heritage, offering hiking trails, viewpoints, and gastronomic proposals in nearby municipalities.