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They are situated under Zbrašov Hill in the left bank of the Bečva River in the spa of Teplice nad Bečvou;
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They comprise a complicated complex of corridors, domes, chimneys and fissures at several height levels;
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They are the only caves of hydrothermal origin in the Czech Republic;
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They are decorated by unique karst fillings – “onyx” coatings on the walls, crystalline aggregates of aragonite and “geyser” stalagmites;
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They contain “gas lakes” – spaces permanently filled with high concentrations of carbon dioxide;
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They are the warmest caves in the Czech Republic – the underground air temperature is 14–16 °C, relative air humidity ca. 90%;
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They were discovered by the brothers Josef and Čeněk Chromý in 1912–13. After they dug the fissure with a seepage of warm air, they descended through a 42 m deep abyss to the underground area;
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Their total length is 1,240 m with a difference in elevation (denivelation) of 55 m;
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The guided tour route is 375 m long and the cave tour takes 60 minutes. In 2003 they were declared a national natural monument.
