Turkey's mysterious 'portal to the underworld' https://www.bbc.com/travel/article/20210629-turkeys-mysterious-portal-to-the-underworld
bbc.com
published 6/29/2021
author
Bella Falk
summary
The ancient city of Hierapolis has long hidden a poisonous secret in its mysterious "Gate to Hell". But modern science has finally uncovered the truth behind the Roman myths.
