There are a number of similar ghost towns in Turkey, but Kaya is the one known best to tourists.
It is extremely evocative. In 1923 (I think) Turkey and Greece arranged an "exchange" of ethnic populations.
The people of Kaya were ethnically Greek but most families had been settled in Turkey for generations. The "repatriation" was in no-way voluntary. Whole villages were basically hounded out of their homes at gunpoint and sent to a foreign country with nothing but the belongings they could carry.
The local Turkish populations left Kaya as it was out of respect to the departed who had been their neighbours for generations.
It does have a very melancholy air about it, but is also stunningly beautiful. This wasn't a poor or insubstantialvillage. Some of the houses are extremely impressive stone-built affairs and there are two large Orthodox churches.
Obviously they haven't been lived in or maintained for over 80 years so they are now largely derlict.
It is certainly worth a visit, but deserves to be treated with respect.