Unec Collapse Valley
Unec Collapse Valley (Unška koliševka) is one of the valleys created by the collapsed ceiling of an underground cave. Such valleys are characteristically steep, with bottoms hat are typically very difficult to access. Unlike those found in Rak Škocjan, the Unec collapse valley has an especially interesting history: it is surrounded by military trenches and bunkers that were built by Italian soldiers between the two world wars. A small part of these trenches, approximately 1.5 km in total, can still be accessed.