With a history dating back centuries, London has seen its fair share of ghosts and ghouls. Many apparitions revolve around the Royals and their long history of bloodshed, but other phantoms seem to have no history at all. Their tales have been lost to time or completely forgotten. Either way, the oldest buildings of London are their long-time residences. A few of them even dwell in underground tunnels deep beneath the surface. And they're not planning on leaving anytime soon.