The Caves of Barać are among the most fascinating in Croatia, and the underground experience just got a little more awesome with the opening of the Centre of Subterranean Heritage. First of all, it just sounds cool, right? Like something out of a superhero movie, where the good guys plan and the bad guys plot. Just 20 minutes from Plitvice Lakes National Park (90 minutes or so from Zagreb), Speleon is a real adventure for all the family, with more than enough to keep visitors young and old engaged and enraptured. The Speleo Polygon is particularly interesting, a speleology-inspired children’s playroom perfect for inspiring young explorers.