Slovenia, with a population of just 2 million, just might be the coolest unknown place in Europe. Join us for zip lining and whitewater rafting in the Soca River Valley, magical Castle Bled overlooking glistening Lake Bled, and Ljubljana, the fabulous capital of this tiny paradise. And don’t forget formidable Predjama Castle built into the side of a rocky cliff, and the most visited cave in the world at the magical Postojna Caves. Click here for more on Slovenia.