Mons Meg Cannon is a gigantic supergun that was made around 1449. It used to fire huge solid cannon balls made out of stone; almost thrice the size of an average human head. Considering the year it was made, it is to my amazement really that the cannon could be fired at a distance of 2 miles. Please note that the cannon ball used to weigh 400 pounds. The ritual of firing the One O’Clock Gun continues to date. The gun is fired at one every day except for Sunday. This particular ritual first began in 1861.