entrance of zoodochos pigi cave mesa vouno santorini greece

colorful rocks zoodochos pigi cave natural spring source fresh water island santorini stalactites stalagmites kamari greec greece mesa vouno adventure ancient attraction attractive dark destination earth entrance environment europe geologic geology greek grotte heritage historic hole inside interior journey landmark landscape limestone mineral mountain nature old rock rocky rugged santorin speleology stone stones thera thira tour tourism tourist travel underground vacation view geological colors cliff spectacular carved santorini mesa vouno kamari island cyclades mediterranean