Gouged out of 350-million year old limestone, the Punkevni Jeskyne (Punkevni Caves) were discovered between 1909 and 1933. Visitors walk through mighty underground spaces and corridors decorated with stalactites and stalagmites, as far as the bottom of the world-famous Macocha Abyss which was formed when the roof of one of the cave domes collapsed. The abyss is 138.7 meters deep. The walking tour is followed by a motorboat ride along the Punkva underground river.
Many of the stalactites and stalagmites are still growing, however one pair will never meet. Over millions of years the stalactite and stalagmite grew to within one inch of each other before their water source disappeared. The pair has been nicknamed Romeo and Juliet.