On Antiparos island, you can find the oldest Dry Cave in Europe, where you can see the biggest stalagmite in the continent. The Cave of Antiparos is among the most beautiful and most significant in the world; this because, in addition to being an enchanting natural site worth seeing, it is inextricably linked to the history of the area and generates great archaeological interest, owing to the findings from the Stone Age discovered in its interior. The engraved inscriptions that ‘adorn’ it are also an inexhaustible source of stories, legends, and information concerning famous—and more anonymous—visitors, like a kind of guest book, whose first page was written hundreds of years before the birth of Christ.
Stalactites and stalagmites, which change form according to the inspiration and imagination of the individual visitor, adorn the ‘Katafygi’ [shelter], as locals used to call the Cave. It is located some 171 meters above sea level, is precipitous, and its interior temperature in the wintertime is at about 15 degrees Celsius. It has an area of approximately 5,600 square meters. Its maximum depth reaches some 85 meters and the descent takes place easily and securely, by way of a cement staircase made up of 411 steps. The exceptional visibility makes possible the observation of details created by ‘Nature, the artist’, and also permits the search for the human presence from the times of the Parian poet Archilochus (c. 680 – c. 645 BC) up to the 20th century.
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https://antiparos.gr/en/episkeptes-2/sights/the-cave.html