I reported on the Underground Cities of Cappadocia back in 2014. What I didn’t realize then was how vast these underground cities are. There is a network of over 200 underground cities in the Cappadocia region of Turkey. Some of these cities are at least 11 levels deep (total of over 200 feet deep) according to National Geographic. Scientists are not sure how they were built.
In the arid valleys of southern Tunisia’s Djebel Dahar region, people have lived for centuries in underground houses whose earthen casing provides protection against searing summer heat and winter winds. But in recent decades, rural depopulation has meant fewer people live in the homes.