Tsar Cannon

The largest cannon in the world, the Tsar Cannon has never been fired. It was ordered by Peter the Great but could not be used because the amount of powder it would take to fire a cannon ball from it would blow up the cannon itself. You can't see it in this picture but the sides of the cannon are beautifully carved and decorated. Cannon balls of the size that would have been fired are on the ground in front of it.