THE ancient Turkish city of Hierapolis hosts what is believed to be the oldest 'Gate to Hell' on Earth ... Parts of the cave reached levels of 4% to 53% of volcanic carbon dioxide, depending ...
Two thousand years later, the Gate to Hell lies in ruins, believed to have been torn apart during the 6th century CE by ...
It is believed to be the oldest ‘Gate to Hell’ on Earth and 2000 years later ... filled with volcanic carbon dioxide. Parts of the cave reached levels of 4 per cent to 53 per cent of volcanic ...
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