>>Here is another one: What happened in Rome, from October 5 to October 14, 1582?
>
>Nothing. These days don't exist, they were skipped when the Julian calendar was replaced with Gregorian.

Did you watch any of the "Rome" series on HBO? Wow, great stuff. In one sense it was a lurid melodrama but it inspired me to go back and read some of the real history. It wasn't until the last episode that I realized Octavian, a kid in the show, would go on to become Augustus Caesar. And the end of the next to last episode -- Pullo, the emotional core of the show -- bloody but unforgettable. 13!