You will see the marvels of Slovenia's Karst region and Adriatic coast on this tour. Visit Postojna Cave, carved out of limestone by the Pivka River over millions of years, and ride a small train into the cave before continuing on foot for half an hour and returning by train. Continue to the fascinating Predjama Castle, the biggest cave castle in the world, with a long and sometimes funny history described in local legends. You will also visit the beautiful coastal town of Piran, also known as "Little Venice".