stalactite and stalagmit mineral formation in a cave

adrenaline adventure beauty canyon cave cavern caves centre column curtain czech dark darkness deep exploration explore explorer extreme formation geology gorge grotto hill information karst kras labyrinth light limestone located macocha mineral mlyn mlafrac12 moravia moravian moravsky natural nature punkevni punkva pustafrac12 republic restaurant river rock scenic skalni speleologist speleology sport stalactical stalactite stalagmit stalagmite stone subterranean tourism tourist tunnel underground upstream vault water