The extraordinary natural beauty of the park merits a full day's exploration, but you can still experience a lot on a day trip from Zagreb Within the boundaries of this heavily forested national park, 16 crystalline lakes tumble into each other via series of waterfalls and cascades. The mineral-rich waters carve through the rock, depositing tufa in continually changing formations. Clouds of butterflies drift above the 18km of wooden footbridges and pathways which snake around the edges and under and across the rumbling water.