Caves of Aggtelek Karst and Slovakian Karst.
Aggtelek is a village in northern Hungary, close to the Slovak border. Aggtelek and Slovakian Karst, together form a geological and geographical unit, Central Europe's largest cave system was formed. The longest cave in the Karst area and also in Hungary is the Baradla Cave, the total length of which, with its side branches, is 25 km. A 5.6 km section lies in Slovakian territory and is known as the Domica. The cave was formed from 230 million-year-old Middle Triassic limestone. The start of its formation can, on the basis of geological data, be put at around 2 million years ago. The waters of the streams got into the system of cracks and, by dissolving and eroding the limestone, slowly widened the crevices and formed the present passages. The dripping water deposited its lime content, forming the stalactites and stalagmites of various size, colour and shape decorating the passages. These formations inspired the imaginations of discoverers and visitors, who gave some of the formations special names like Dragon's Head, Tiger, Mother in Law's Tongue, the Hall of Columns and the Hall of Giants.