to nevsehir in central anatolia, to go behind the scenes at excavations on a huge underground city that was stumbled on by a group of local construction workers purely by chance. and what has been uncovered is truly remarkable. in the heart of the town, among the modern houses and office buildings, workers made a startling find as they cleared a hillside for redevelopment — the largest underground city of its kind. experts estimate the caves could extend over a50,000 square metres. wow! look at all of this! ifind it quite hard to believe that there were people living on top of here and all of this was actually hidden, and so they had no idea that this was here? no. that is insane! what is all of this? this is a monastery.