Slanské vrchy, museums and technical monuments

Slovak opal mines can be found in eastern Slovakia on the territory of Slanské vrchy. They are situated 20 km southeast of Prešov, between the villages of Červenica and Zlatá Baňa. Opal mines have been known around the world since the 16th century. The largest opal called Harlequin was found in 1775 in a stream in the village of Červenica. Its weight is almost 600 grams. It is currently housed in the Natural History Museum in Vienna. The golden age of opal mines near the village of Červenica today is reminiscent of the reconstructed entrance to the tunnel. Slovak opal is stored in...