This is one of - if not the biggest cannon in Scotland. It's called MONS MEG. Now you can see why our heroine is standing next to it. If you look closely about a third of the way down the cannon you can see part of it missing. That because the last time it was fired was in 1681 when the barrel burst. Here's some other facts...

Mons Meg was one of a pair of giant siege guns - known as bombards - which were given to King James II by the Duke of Burgundy in 1457. The muzzle-loaded cannons fired "gunstones" weighing more than 330 pounds each. (They were so heavy they could only be moved three miles a day by a team of 100 men!) It fired these stone over TWO MILES and through castle walls eight feet thick!