Duddon Furnace

This industrial relic sits quietly in a wooded valley just outside Millom, and it's the sort of place that makes you realise how utterly different the Lake District was 200 years ago. Duddon Furnace is what remains of an 18th-century blast furnace - essentially a massive stone tower where local iron ore was smelted using charcoal from the surrounding forests. You can walk right up to it, run your hand along the weathered stone, and try to imagine the roar and heat that once came from this thing.

What you're looking at now is a shell, really - the furnace itself, some associated ruins, and interpretive boards that tell you what actually happened here. It's not a museum or a visitor centre with a cafe. It's just the furnace, standing there. Historians and industrial archaeology enthusiasts will find it properly interesting, and anyone with a nose for local history will get something from it. Kids might wander around for twenty minutes, then want to move on.

The walk to reach it from nearby car parking is straightforward and pleasant through woodland - factor in an hour to see the site properly without rushing. Access appears to be free and open year-round, though there's nothing on-site in terms of facilities. If you're based at Harbour Lights Campsite nearby, it makes for a solid half-morning excursion before heading further into the Lakes proper. Worth the detour if industrial heritage speaks to you. If you're expecting something flashy or polished, you'll be disappointed.