Katafyki Cave
Katafyki is a cave located in Dryopida on the island of Kythnos in the Cyclades. It has been named "Katafiki" as it has served as a shelter in various time periods. It also bears the name "Giorgos Martinos Cave" in honor of the geologist who studied it.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).