AOL Money & Finance has a neat list of the Rarest Items in the World. Like this, for instance:
One of the rarest bottles of wine ever sold was purchased by Christopher Forbes for a mere £105,000 ($160,000). It was an unmarked green glass bottle with the inscription of "1787 Lafitte Th. J." (now known as Lafite and thought to be owned by Thomas Jefferson), found behind a wall in Paris.
Link - Thanks Pam!