In order to escape from Roman invasions
during the 7th century, the Christians of the region built complete
underground cities. Some of them extending as deep as 14 stories
and there the populations were able to live hidden for months.
They were so well hidden that the underground cities were undiscovered
until the 1960's.
Among the most famous and well excavated
are Derinkuyu and Kaymakli. The entrance to Derinkuyu is very
close to the present day city, meant obviously to escape from
immediate danger and for shorter term stays. Kaymakli is also
worth to visit with its wine cellars, supply areas, chapels, stables