Signed, Sealed, Delivered @The National Archives

Did you know that Saddam Hussein sent a congratulations card to President George H. W. Bush? Or that Richard Nixon formally applied to be an FBI agent? Or that Michael Jackson got a patent for a special performing shoe?

Well, if you didn't, you would if you had visited Making Their Mark: Stories Through Signatures, the newest exhibition at the National Archives.

Last week, the archives held a special tweet-up preview of the exhibition, which officially opened Friday and will be on display through Jan. 5.

Here are some pictures we took which will give you just a small sample of what you will see if you visit the exhibition.

For even more information on the tweet-up and the new exhibition, check out this Storify by clicking here.