black and white. couple of tourists exploring the cave. the interior of the cave. touristic hiking route. concept of excursions

alanya asthma astm attraction big calcite calcium cave cavern cavity crystal cuceler dangerous deep depth drop earth erosion formation gallery geology huge inside interior karst large limestone magaras mersin mineral old process rock sapadere sight sightseeing speleothem stalactite stalagmite stone structure tourism tourist travel trkiye trlar tunnel turkey turkish underground water