Greime means "you can't see" in Turkish. In order to escape persecution, Christians dug out churches, houses and cattle cave communities in their living rooms, forming a culture of coexistence. Because the Christian disciple Saint Paul believed that Greime's environment was very suitable for training missionaries, he chose to establish a seminary here, so Greime became the belief center of Asia Minor in the 4th and 9th centuries. The cave Church in the open-air museum was the best witness of Greime's firm belief.