Heritage of Mercury. Almadén and Idrija


World Heritage Identification Number: 1313

World Heritage since: 2012

Category: Cultural Heritage

Transboundary Heritage: Yes

Endangered Heritage: No

Country: Slovenia, Spain

Continent: NA

UNESCO World Region: Europe and North America

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Mining Legacy: A Journey Through the Heritage of Mercury - Almadén and Idrija

The Heritage of Mercury, a shared UNESCO World Heritage Site, offers a unique glimpse into the rich history of mercury mining that spans continents and centuries. This designation encompasses two significant sites: Almadén in Spain and Idrija in Slovenia.

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UNESCO Description of the World Heritage Site

The property includes the mining sites of Almadén (Spain), where mercury (quicksilver) has been extracted since antiquity, and Idrija (Slovenia), where mercury was first found in AD1490. The Spanish property includes buildings relating to its mining history, including Retamar Castle, religious buildings and traditional dwellings. The site in Idrija notably features mercury stores and infrastructure, as well as miners’ living quarters, and a miners’ theatre. The sites bear testimony to the intercontinental trade in mercury which generated important exchanges between Europe and America over the centuries. Together they represent the two largest mercury mines in the world, operational until recent times.

Encyclopedia Record: Heritage of Mercury. Almadén and Idrija

Heritage of Mercury. Almadén and Idrija is a joint UNESCO World Heritage Site in Almadén, Castile-La Mancha, Spain, and Idrija, Slovenia. The property encompasses two mercury mining sites. In Almadén mercury has been extracted since Antiquity, while in Idrija it was first found in 1490.

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Additional Site Details

Area: 104.1 hectares

UNESCO Criteria: (ii) — Significant interchange of human values
(iv) — Outstanding example of a type of building or landscape

Coordinates: 38.7752777778 , -4.8388888889

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Image of Heritage of Mercury. Almadén and Idrija

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Nearby World Heritage Sites

Royal Monastery of Santa María de Guadalupe
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Caliphate City of Medina Azahara
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Historic Centre of Cordoba
100 km — Spain
Archaeological Ensemble of Mérida
131 km — Spain
Historic City of Toledo
139 km — Spain
Last updated: January 18, 2026

Portions of the page Heritage of Mercury. Almadén and Idrija are based on data from UNESCO — World Heritage List Dataset and on text from the Wikipedia article Heritage of Mercury. Almadén and Idrija, licensed under CC BY-SA 4.0. Changes made. Additional original content by World Heritage Explorer (WHE), licensed under CC BY-SA 4.0. WHE is not affiliated with UNESCO or the World Heritage Committee. Legal Notice. Privacy Policy.

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