The stiff lava in the crater of the volcano during the stiffening process split up into several vertical polygonal columns, which are near 50 m high.
The exhibition areas display the life of the volcano, the history of the local basalt quarrying and the natural values of the National Park. The visitors can take part in a geological time travel by means of a stonepark formed by the characteristic rock types of Transdanubia
The Káli-basin offers several look-out points with beautiful panorama, but maybe the most beautiful of them can be seen from the western edge of the quarry-yard of Hegyestű where with the help of the panorama-board we can identify the surrounding hills. Lake Balaton, Fonyód Hill from the south, Badacsony Hill, Gulács Hill, the Keszthely Hills, Csobánc Hill, Fekete Hill, Boncsos peak from the west and Tátika Hill can be seen in the distance
Once the flint acids and thermal waters which had erupted here following the volcanic activity cemented the loose sand sediments just to be reformed again by the wind, the rain and the erosion. The size , shape, and height of the stones are surprising. Some of them reach the size of a house, others could fill a whole rooom. As if a giant had been walking here throwing gigantic pieces of rocks around for fun.