Curated Itinerary
Heritage of Mercury: Almadén and Idrija
Two mercury towns, one World Heritage listing: underground at Almadén’s mining park, into Idrija’s 500-year-old galleries, and up to Gewerkenegg Castle’s museum.
Take this route into Google Maps
From Almadén to Gewerkenegg Castle, in the order we curated them.
➤ Open the stops in Google MapsThese places are spread over thousands of kilometres, and Google will not always join them into one route. It opens with the stops loaded in our order: from there pick two that are close to each other, choose how you travel, and add places of your own. For a single leg, the directions on each stop's own page work better.
This itinerary pairs the two towns of the UNESCO listing “Heritage of Mercury” (2012): Almadén in Spain and Idrija in Slovenia, the mines that supplied most of the world’s quicksilver when quicksilver refined the world’s silver. Three stops — Almadén’s mining park, Idrija’s old-town mine entrance, and Gewerkenegg Castle, the mine’s Renaissance headquarters turned museum.
The route’s logic is economic history: from the 1550s the amalgamation process tied American silver production to these two European valleys, and the listing honours that intercontinental supply line rather than either town alone. Visiting both is the only way to read the property as UNESCO wrote it.
Practically, treat it as two short trips: half a day underground at Almadén from Madrid or Córdoba, and a full day in Idrija from Ljubljana, castle museum and žlikrofi included. Book the underground tours ahead in summer.
Read the full story of this route in the CHO Magazine →
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A word from your host
This is a route about consequences: what you see is two modest towns, what you are looking at is the hinge of the sixteenth-century world economy. Do both mines underground — the story only lands at gallery depth.
Getting around
Almadén is about three hours from Madrid by car; Idrija under an hour from Ljubljana with a regular bus. Underground visits are guided and should be booked ahead in high season; temperatures below are cool year-round.
Step by step
Almadén
The world's largest source of mercury, Almadén has produced a quarter-million metric tons over two millennia.
Idrija
A UNESCO World Heritage mercury-mining town in western Slovenia, with five centuries of industrial infrastructure, miners' quarters, and a rare workers'…
Gewerkenegg Castle
A castle in downtown Idrija built to oversee mercury mining operations, now housing the town museum and preserving industrial heritage.
Download for tour navigation
🔒 The walk and the notes are open to everyone on this page. The files to take with you — the stop list as a PDF, and the GPX and KML tracks for your phone — come with a CHO account, and the free one includes them.
Walk it with the navigator on
These places are spread over thousands of kilometres, and Google will not always join them into one route. It opens with the stops loaded in our order: from there pick two that are close to each other, choose how you travel, and add places of your own. For a single leg, the directions on each stop's own page work better.