Edinburgh castle is built on a volcano and is probably one of the most beautiful sights in the whole of Great britain. Similarly to the Tower of London, it has been used as a residency for the royals, a prison and is still a functioning army garrison. It was built in the early 12th century in the memory of Queen Margaret with the chapel (St Margaret's Chapel) being the oldest building on the site as well as in Scotland. The story goes that Margaret died of a broken heart when she discovered that her husband, King Malcolm III had died. The castle is one of the most haunted places in Scotland with the most famous story being that of the little drummer boy. When tunnels were discovered underneath the city, the boy was sent down armed with only a drum to beat so that people could follow his progress above ground. Suddenly, the drumming stopped, the boy was never seen or heard of again and the tunnels were sealed up regardless of his fate being confirmed. If you listen carefully, you can still hear the faintest sound of a drum playing within the castle. Whilst every castle has its ghosts and ghouls, they also have their prisons and few were as terrifying as the ones in Edinburgh castle. Some of them were so small and dark that some guards actually forgot about the prisoners who died in there after starving to death. Apparently there's also a pit underneath King James I birth chamber but it wasn't sure who was thrown down there and left to die. Be sure to stick around for the afternoon when you visit so you can see the One O'Clock Gun go off.