We then went up to the Village of Maranthi to the Marble Mining works, really more like a cave. The entrance is a sheer drop down into the earth and you soon need to have a torch to see, and you really should have good walking shoes on your feet. It is very steep and the floor of the cave is slippy, you can go in one entrance and out the other, but it looked a bit dangerous without a guide so I did not brave it. If you want to do the underground walk the book Greek Island Hopping 2010 has a map of the mine and full instructions.
In Antiparos, a very small, quiet Island. It did not take long to see the square shaped Kastro and visit the Great Cave.I am glad I did not stay on Antiparos as there was not that much to do and the beaches seemed to be very poor. We had seen all of the isalnd by midday, so took the 7 minute ferry trip back to Paros.