Very few places on our green Earth are more guarded than the Vatican's secret archives. If you were ever itching to know about the alleged dark underbelly of the Catholic church, then you're going to have to keep itching. There's just no way you will gain access to this place. Then again, it's believed that these archives contain mostly historical scrolls in Latin, so you probably wouldn't know what to do with them anyhow.
It's believed that some of these scrolls date back to the 9th century or even earlier than that. It's said that there are approximately 55 miles worth of shelves housing books. We wonder if there's anyone in the world who actually kept up with what's in there.