supljara cave in plitvice lakes national park (unesco natural world heritage) - plitvice, croatia

supljara cave plitvice lakes national park unesco natural world heritage croatia spilja nacinalnom parku jezera hrvatska nacionalnom plitvicka adventure background beautiful beauty cavern dark deep drawing entrance environment explore fantasy geology green ground hike hiking hole hollow inside landscape light mountain nature outdoor outdoors outside rock rocky scene scenery scenic shadow sky speleology stone summer sunlight tourism trail travel trees tunnel underground view wild wildlife