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Özkonak Underground City

Ten-level rock-cut underground city near Avanos in Cappadocia, notable for its rolling-stone defensive doors and a ventilation and speaking-tube system said to let defenders communicate between levels while under siege.

Dated events and their evidence

• 400 BCE mainstream
  in use (Byzantine-era attribution, earlier origin debated) source
• 1972 CE mainstream
  rediscovered source

Where

38.8131° N, 34.8394° E

Sources

• https://en.wikipedia.org/wiki/%C3%96zkonak_Underground_City
• https://www.historyhit.com/locations/ozkonak-underground-city/

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