The Monastery Valley located in downtown Guzelyurt, is a 5.5 km long valley featuring rock carved churches, chapels and underground cities.
The traces of early monastery life can be observed in Monastery Valley. The theologian from Nenezi, St. Gregorious Theologos, chose Guzelyurt as his base in the 4th century and worked to spread Christianity in Anatolia. Accordingly, the early monasteries founded in Guzelyurt very efficiently reflect the characteristics of that age. Of the 28 churches in the valley, 17 have single halls, 7 have double, and 1 has three halls, while 1 has a free plan and 2 have cross shaped plans. Again, of the 7 main church plans seen in Cappadocia , 5 can be seen in the churches in Guzelyurt.
Many churches and underground cities including Kilise Camii (Church Mosque), Sivisli Church, Papaz Evi (Priest House), Kalburlu Church, Komurlu Church, Hacı Saadet Koc Church, Cafarlar Church, Comlekci Church, Meryem Church, located in the valley are important historical structures from the Byzantium period