There is a pivotal conversation between Jesus and Peter in Matthew 16 that goes something like this:
Jesus: who do people say that I am?
Disciple 1: Ohhh a prophet or something like that.
Disciple 2: Uhhh Elijah?
Jesus: But who do you say that I am?
Peter: you are the Messiah, the son of the living God!
Jesus: yes! I will build my church on this, and the gates of Hades will not overcome it.
(My paraphrase of Matthew 16:13-19)
As it turns out, this conversation happened in a particular place called Caesarea Philipi in the northern part of Israel. According to tradition, Jesus points to the above pictured cave when he refers to Hades, which is in a modern day park called Temple of Pan. A reminder to us all that as Christ builds his church, nothing can overcome it!