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Škocjan Caves, Slovenia by hk_traveller, via Flickr. International scientific circles have thus acknowledged the importance of the Škocjan Caves as one of the natural treasures of planet Earth. They represent the most significant underground phenomena in both the Karst region and Slovenia.
Škocjan Caves, Slovenia. The one of the top 10 attractions in Eastern Europe. They’re also on the UNESCO World Heritage. They live up to their reputation by being one of the largest underground canyons in the world with the Reka river still carving through it. At 60 meters wide and 140 meters deep, this canyon is a fraction of the Grand Canyon’s size, but the fact that it’s all underground makes it feel bigger.