Göreme Open-Air Museum

It is located just outside the town of Göreme in Cappadocia, Turkey.
It is a complex of rock-cut churches and monasteries carved into the soft volcanic rock, forming an outdoor museum.
It is a UNESCO World Heritage Site and contains some of the best-preserved examples of Byzantine art and architecture in the region.
Visitors can explore numerous churches decorated with frescoes, chapels, monastic cells, and refectories.
Yes, there is a ticket fee. The Dark Church requires an additional ticket for entry.