Vatican Secret Archives – Vatican City
This document, a letter from French philosopher Voltaire, is just one of thousands in the Vatican’s archives. The public isn’t allowed to peruse its amazing collection, but researchers are if they have the time to go to Rome and learn Latin.
Not many documents have been digitized because they’re handwritten, making it hard for machines to scan them. But because the Catholic Church is so secretive, conspiracy theorists have tried to guess what’s inside their vaults for years.