Midyat, Turkey - Through a basement door in southeastern Turkey lies a sprawling underground city - perhaps the country's largest - which one historian believes dates back to the ninth century before Jesus Christ.
Archaeologists stumbled upon the city-under-a-city 'almost by chance' after an excavation of house cellars in Midyat, near the Syrian border, led to the discovery of a vast labyrinth of caves in 2020.
