passage for tourists with big stalactites and stalagmites in postojna cave, slovenia, europe

passage for tourists big stalactites and stalagmites postojna cave slovenia europe wonderful picture cavern alight alps attraction beam beams beautiful caving ceiling colour colourful column dark deep formation geologic geologist geology holiday illuminated jama lighted line lovely magnificent massive national nature near nice passageway rail ray rays relief rock romantic scenery scenic screen shade stalactit stalagmit stone stoney tour tourism touristic travel underground view stalagnat stalagnates huge