Ten Trillion Dollar Zimbabwe Bank Note
From Wikipedia: "Zimbabwe's peak month of inflation is estimated at 79.6 million percent in mid-November 2008."
Which brings us to this:
This a genuine ten trillion dollar bill from Zimbabwe. It's in near mint condition.
If you're interested in the how a country ends up printing $10,000,000,000,000 bank notes you can learn more here
You can purchase a display for this bank note here.