Investigate the most diverse cave system in the world, one of the largest and most visited karst cave systems in Europe, on this memorable tour. After a leisurely journey across the nearby border into Slovenia, you’ll arrive at the Postojna Cave system, a 12-mile-long series of passages, galleries and chambers renowned world-wide for expansive and variously shaped caverns, stalactite and stalagmite formations and water features. You’ll appreciate the cave’s easy accessibility, as it is considered a horizontal cave, meaning the majority of its features can be accessed from well-tended pathways. For additional comfort, board a small electric train that has been running through the caves for more than 140 years. You’ll be awed by an underground world filled with dazzling formations in myriad colors as you follow the path of Austrian Crown Prince Ferdinand I, the caves’ first official visitor in 1819. Travel nearly six miles of the caves by train and on foot before emerging to enjoy some time on your own in this lovely land filled with natural wonders.