The Cave of the Apocalypse is a sacred site where it is believed that Saint John received his vision of the Apocalypse or the Book of Revelation. 

The cave itself is small and simple with a narrow entrance and low ceiling, but it has been a place of pilgrimage and worship for centuries. 

Visitors to the cave can see the small rock bed where Saint John is said to have slept, as well as a fissure in the rock that is believed to have been made by the voice of God. 

The cave is also home to a small chapel that was built in the 18th century and features beautiful frescoes depicting scenes from the Book of Revelation. 

The Cave of the Apocalypse is considered a significant religious site for Christians, and it continues to attract visitors from all over the world who come to pay their respects and experience the spiritual energy of this sacred place.