I wondered a bit that we didn't have a thread about one of the most well-known cryptography-thing, The Beale Treasure.
It's said this guy, Thomas J. Beale, buried a great treasure in 1819 somewhere in the vicinity of Bufords, in Bedford County, Virginia. The value of it would now be about 30 million dollars. Beale left three encrypted papers about the treasure to Robert Morriss. Papers looked like this:
"71, 194, 38, 1701, 89, 76, ......."
and they would tell exact the location of the treasure and Morriss was to get the decryption key later. He didn't get the key, so he worked for three years on the papers, got bored, and handed them to James B. Ward who managed to decode the 2nd paper by using the US Declare Of Independence (DOI for short from now on).
The DOI words were numbered:
"When(1) in(2) the(3) course(4) of(5) human(6) events(7) it(8) becomes(9)......."
and the first letter of the word the number in the papers were taken. So if the sequence was "1, 6, 2, 4, 6" it'd be decoded to "which". You got the point.

Now the problem is that dozens of people have tried to find some key to decrypt the first and the third paper (1st is more interesting since it tells the exact location, 3rd only the actual owners... ) but have failed.

The main links I used for this:
The Beale Cryptograms
The Beale Papers
The Beale Chipher - A Dissenting Opinion

So, one of you might want to solve this (or at least share some thoughts)?-)