Slovak opal mine is one of the most beautiful places in Slovak republic. Slovak opal mine is the oldest opal mine in the world and the onlyone opal mine in Euroasia. In the opal mine are more than 30 km of corridors.
mine cart in Slovak opal mine
Slovak opal mine located between town Prešov an Košice. GPS : 48° 54' 14.0226381" N , 21° 27' 38.3184242" E
Entrance to Slovak opal mine http://www.opalovebane.com/vstup-od-opalovych-bani/