The Ecomuseo Minero del Valle de Samuño, in Langreo, is visited on a mining train that leaves from El Cadavíu station, climbs along the old coal line, and runs more than a kilometre into the Socavón Emilia, a 19th-century mine. It opened in 2013; the train runs seasonally, and it's worth booking a spot in advance.
Some experiences are worth a whole trip on their own, and this is one: boarding a mining train at El Cadavíu station, in Langreo, climbing through a valley of chestnut groves along the old coal line, and then, all of a sudden, the mountain swallows the train. Over a kilometre inside a 19th-century mine, the Socavón Emilia. That's how you visit the Ecomuseo Minero del Valle de Samuño, opened in 2013 a short way from Sotrondio, and we don't know anyone who's come out unmoved.
A museum the neighbours asked for
The Ecomuseo del Valle de Samuño wasn't born in an office: it was born of the people. It was the valley's residents who asked to have their industrial heritage brought back, and in 2013 the project opened its doors. At its heart is Pozo San Luis, sunk between 1928 and 1930 by Carbones de La Nueva — part of the Real Compañía Asturiana de Minas — which operated until 1969 and was declared a Bien de Interés Cultural in 2013, the same year it opened.
The fact that a mining museum exists because miners' children and grandchildren demanded it says a lot about how the memory of coal is lived here: not as nostalgia, but as identity. That pride shows in every detail of the visit.
From El Cadavíu to the heart of the mountain
The star experience is the train. It sets off from El Cadavíu station and follows the old rail line that once carried the coal down, climbing through chestnut groves — in autumn, the valley turns into a blaze of ochre — until the track does the unthinkable: goes into the mountain. The train pushes more than a kilometre inside the Socavón Emilia, a 19th-century mountain mine, and in there, with the rock over your head, you understand things no book explains.
The museum rounds out the visit with the history of the mine's operation, mining techniques, how work was organised, and safety. All of this, too, happens within the Paisaje Protegido de las Cuencas Mineras, part of the Natura 2000 network: the beautiful paradox of a valley that was once pure industry and is now protected nature with a memory.
Practical details, and a tip from us
The mining train runs seasonally, and it's well worth booking a spot in advance, since departures fill up. The site has a café and facilities, and the visit pairs well with the rest of the area's mining heritage: the MUMI and Pozo San Vicente are in the neighbouring concejo of San Martín del Rey Aurelio.
Our tip: if you're travelling with kids, this is the valley's winning plan. The format — train, tunnel, real mine — turns industrial history into pure adventure, and adults feel exactly the same way, even if they hide it better. From our places to stay in Sotrondio and the Nalón Valley, it's a few minutes away: without question, it's the most spectacular neighbour we have.