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Old Greek and Roman city.
Is it a cave on the third picture? Looks amazing.
Micha, it's amazing place, called the Ear of Dionysus. Apparently, according to a myth, maybe created by Caravaggio, it was carved by prisoners of war, from the Greek wars between the Greek cities. Some several thousand Athens soldiers were held prisoner there and were starved of hunger and terror. The form of the cave gives an amplifies the echos. It is probably from natural origin.