The current entrance is a rock collapse from the more recent geological period because no significant changes have been detected in the calcite formations in the entrance corridor due to temperature fluctuation and decreased air humidity. The surface of the dripstone changes considerably over a longer period, turning grey to dark grey. In the entrance tunnel, the grey layer of calcite is not yet very thick but it is considerably grey and dingy in colour.

The entrance to the cave is a small sinkhole. The collapsed gravely entrance corridor leads in the north-easterly direction to the dance hall. This area is 25 m wide and over 10 m high and has collapse gravel at the bottom. Along the western edge, there is a man-made stage area where traditional events were held. It is called the old Dance Hall even though the original dance hall was located hundred meter further down the tunnel. This hall features a mighty dark-grey dripstone column which was named Maverby the visitors.

The corridor is continuous yet articulated, dropping and climbing at different points and expanding to a width and height of up to 30 m. The slanted entrance tunnel descends and becomes narrower and after a 100 m levels off. The ceiling, walls and floor are covered with thick stalactites, columns, stalagmites and curtains. This section of the cave was called Dripstone Alley, because it fascinated the very first visitors.

At the end of this section, the floor and ceiling begin to descend rapidly, while the cave area loses the caracter of a corridor. Here is a natural 15 m deep gorge leading into the lower hall, where only rare visitors in 18th century ventured. One of them was Baltazar Hacquet. In 1829 and 1830, a passage was cut and secured for public visits, skirting Orgle (Organ) and opening into the picturesque Hall of the Fairies which was once called the Underground Garden. It is 30 to 40 m wide and 30 m high, featuring the Great Column, a 22 m high stalagmite. The former and current public footpath ends 400 m from the entrance, in this hall, which is the finest, most picturesque and best preserved part of the cave.

Then the cave turns due north winding its way between the collapsed blocks of rock and continues into the second part of the cave, characterised by smaller chambers which rarely exceed the width and height og 10 m. The dripstone-lined corridor widens and narrows several times to the end of the cave. The lowest part of the tunnel, which is not open to the public, is called Fabris`s corridor and features fine stalactites and helictites. It appears as a giant, slanted fissure, dropping almost 60 m deep. At the bottom, there are several clay sediments, which suggests that karst water trapped at the bottom of Vilenica rose and receded at an elevation of 237 m.