The Vatican and the Catholic Church already seem to be mysterious as it is, but did you know they had a secret archive where they store documents relating to the Catholic Church and some of them can date as far back as the eighth century? The entire archive is so huge it has 53 miles of shelves, and the entrance is strictly forbidden for anyone who is not a researcher with a special permission for access. The place includes such documents as information of Martin Luther’s excommunication and a letter from Michelangelo to Pope Julius II.