Šupljara Cave

Šupljara — 'the hollow one' — is a natural rock tunnel in the cliff wall of the Lower Lakes canyon, and it is one of Plitvice's most underappreciated experiences. The cave is essentially a fifty-metre chimney that punctures cleanly through the cliff, with its lower entrance emerging on the boardwalk between Kaluđerovac and Milanovac Lakes, and its upper opening on the panoramic trail above. Walking up through the cave feels like stepping into a lift shaft carved by water: cool air rushes down through the shaft, calcite formations glisten on the walls, and a series of natural stone steps leads to a keyhole-shaped exit that frames Milanovac Lake in an almost perfectly Instagrammable arch. Bring a small torch — while the top and bottom are lit by daylight, the middle section is genuinely dark, and the steps are slick. The cave has a curious cinematic pedigree: Karl May's 1962 Winnetou movie filmed key scenes here, back when Šupljara was cast as an American Wild West hideout for the Apache chief. Ten minutes to walk through, half an hour if you photograph patiently.