petralona cave, ancient karst cave with stalactites and stalagmites, cenote ceiling

formation cave quail caving geology rock carving stalagmite wood temple art trunk stalactite wadi sculpture tree terrain canyon petralona creece- may 2007: ancient karst stalactites stalagmites cenote ceiling creece limestone decoration cave creece ancient stalactites stalagmites cenote ceiling limestone decoration nature cavern rock stalactite stone stalagmite undergroun mountain geology travel underground dark landscape grotto tourism canyon rocks texture