Ancient Cities Underground

Cities of the Underworld
Cappadocia
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They say, in the video, that it was first dug out by pagans and later Christians were using it. I don't know if that's true, the evidence looks like it was just the christians.
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Since the late 300s BC the name Cappadocia came to be restricted to the inland province (sometimes called Great Cappadocia), Upper Cappadocia, which alone will be the focus of this article. Lower Cappadocia is focused to elsewhere.

According to Herodotus,[1] in the time of the Ionian Revolt (499 BC), the Cappadocians were reported as occupying a region from Mount Taurus to the vicinity of the Euxine (Black Sea). Cappadocia, in this sense, was bounded in the south by the chain of the Taurus Mountains that separate it from Cilicia, to the east by the upper Euphrates, to the north by Pontus, and to the west by Lycaonia and eastern Galatia.[2]

The name, traditionally used in Christian sources throughout history, continues in use as an international tourism concept to define a region of exceptional natural wonders, in particular characterized by fairy chimneys and a unique historical and cultural heritage.