Much less visited (but arguably more enchanting) than Postojna, the Škocjan Caves are a stunning system of echoing chambers, secret passages and collapsed valleys carved out by the Reka River, which begins its journey some 50km south near the Croatian border. Daily tours take you through several stalactite-infested chambers and halls, before you reach the breathtaking Murmuring Cave, reputedly the world’s largest subterranean canyon. To get here follow the 3km footpath from Divača train station towards the caves (see map at the station).