Located in the Byalata Staga ridge overlooking the Zlatitsa River valley, Kristalnata (Crystal) Cave is a small, semi-lit oval chamber measuring 21 by 12 meters and 6 meters high.

Its main feature is a floor covered in yellow and brownish prismatic calcite crystals ranging from pea- to brick-sized. A gentle slope made of thousands of these crystals leads from the entrance to the bottom. In the past, illuminating the cave made the whole chamber glitter like a fairytale treasure, though exposure to air has dulled their shine over time.

The cave's current state and name stem partly from human activity. In the 1930s, a local entrepreneur began quarrying calcite from the walls to supply non-ferrous metallurgy for copper ore purification, transporting sacks on donkeys down to the train station. This expanded the chamber and scattered crystals along the approach trail.

After the unprofitable venture quickly collapsed, local shepherds used the cave to shelter livestock. Though weathering faded the mineral's luster, the crystals remain a vivid testament to the area's unique industrial history.