Nevşehir’s fortress hill has a fortress on it's top, that I once visited but found closed in 2017. The hill used to be covered with low-grade houses or the geçekondular variety. But starting in 2013 they were destroyed, and to everyone’s surprise under them a huge underground city was discovered. It is being explored and excavated now, I envied a group of dignitaries that were allowed to visit while I could only view them from the top of the hill. The city may well be the largest ever found, an estimate I read in a National Geographic article suggested it might be 1/3 larger than Derinkuyu (so far the largest) and may have housed 20.000 people. It will probably take many years before it will be open to public view but here are, together with shots from 2017 and earlier, of the hill, the fortress and the excavation.

A church has been discovered also, I only know it from an article, it seems to have important mosaics.