The small cave temple, also known as the Spiliara of the Patsos gorge, is formed on a rock roof, in a hollow of the rocks on the eastern slope of the gorge, which can be found 400 m from its southern entrance at an altitude of 490 meters. Its western wall is built, while its eastern wall and part of the coffered ceiling are part of the natural rock. In ancient times, there was an open-air sanctuary of Skull Mercury at this point. Numerous archaeological finds that have been located here and date from the end of the Bronze Age to Roman times, confirm the religious use of the area many centuries before the appearance of Christianity.

Today the temple, dedicated to the patron saint of children, is especially beloved by the believers, who come here to be supplied with holy water, which drips from the ceiling of the cave. The saint’s philanthropy is also evidenced by the numerous tombs that cover the walls of the rock. Also, every year on the 17th of January, the day of his feast day, crowds of people flock to the church to honor Saint Anthony.