Las Médulas (Galician: As Médulas) is a historic mining site near the town of Ponferrada in the region of El Bierzo (province of León, Castile and León, Spain), which used to be the most important gold mine in the Roman Empire. Las Médulas Cultural Landscape is listed by the UNESCO as one of the World Heritage Sites. Advanced aerial surveys conducted in 2014 using LIDAR have confirmed the wide extent of the Roman-era works.