Underground cities of Turkey
google search for the underground city of Derinkuyu
People once lived in Lava houses. Look and marvel:

Cappaducia

goreme
and they built underground cities over 4000 years ago:

Derinkuyu

Stone door to an underground city

An underground pottery factory
Turkey: ancient civilisations:
world travel:

Ephesus – kuretes – The Arcadian Way (marble)

Ephesus – The Domitian Temple

Ephesus – Theater
underground cities and civilisations: