Greek island of Nisyros: Tour of Paleokastro, the ancient Acropolis and fort in Nisyros, Greece. Let's visit Nisyros island in Greece and let's go to Paleokastro which is a classical period acropolis of the ancient city. Paleokastro in Nisyros is still in very good condition because of its high quality construction and represents one of the best fortification works of ancientry, basaltic andesite, one of the hardest rocks in the world. The main gate of Paleokastro is composed by well-hewn stone blocks with a perfect fit of the connecting surfaces. The total length of the fortification is very big, as it surrounds the entire land-lubber site of the rocky hill above the south end of the town of Mandraki. The wall and the cliff delimit an area of about 130 acres total perimeter almost 2 km, while the weight of some of the stones that form the wall, reach 3.5 tonnes.
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