stalactite formations inside cave of the lakes, spilaio ton limnon, in kalavrita region, greece

cave lakes stalactite greece kalavrita formation inside spilaio ton limnon region interior speleology gallery exploration kastria wall stone nature speleological ceiling kalavryta rock figure stalagmite natural cavern microclimate hang tourism geology mountain dark underground beautiful caving subterranean ancient travel hall colorful column geologic attraction scenic light heritage europe lake water