The Falun Mine is one of the most extraordinary industrial heritage sites in the world and a UNESCO World Heritage Site. It operated continuously from at least the 10th century until 1992 — over a thousand years — and at its peak in the 17th century supplied around two-thirds of Europe's copper. Sweden's emergence as a great European power in the 1600s was largely funded by the mine's output.
Underground tours take you down into the cool, ochre-stained tunnels past rock faces impregnated with iron sulphate and copper compounds that have turned the walls into a palette of rust-red, blue-green, and grey. The scale is surprising — the main chambers are enormous, carved out over centuries. Above ground, the Great Pit (Stora Stöten) is a vast open crater left by a catastrophic collapse on Midsummer Day 1687, when most of the mine's internal structure fell in at once. The on-site museum explains the history well.
The mine is also the source of Falun red (Falurödfärg), the distinctive dark red paint derived from copper slag that coats wooden houses and barns across the Swedish countryside. The recipe has barely changed since the 16th century.