Booked a tour for €15 through the tourism office the day before. This is the only way to see the church as it is privately owned. You see a lot in the tour and our guide Sara was excellent. Worth doing, it was very impressive to see what is hiding underground! They do not allow photos inside You can also climb the church tower. It is €2 at the tourism office and they literally hand you over the keys to the door! Super cool. You open the door, lock it behind you and climb up the stairs! Great views. I think there are 2-3 sets of keys because we saw a couple coming up as we were heading down.