Athens, Georgia
Athens is located about an hour plus south of Greenwood.
The only double-barrel cannon in the world, it was a prototype that was fired once.
Since they couldn't precisely coordinate both barrels, the test was a major failure.
The town of Athens deigned to recognize this unique bequest and never levied any taxes on the tree. When the original tree died c. 1943, the good ladies of the town planted a seedling of the original to continue the tradition. It is listed in the Guiness Book of World Records as "the only tree to own itself".