London Below is a fictional realm depicted in the novel "Neverwhere" by Neil Gaiman. It exists beneath the city of London and is inhabited by a variety of unusual characters, including angels, beasts, and murderers. This hidden world is a place of mystery and danger, where the rules of the surface world do not apply. In London Below, locations often mirror those above but are twisted and surreal. Landmarks like Blackfriars and Waterloo take on new meanings, and the inhabitants often struggle for survival. The narrative explores themes of social invisibility and the consequences of neglecting those who live on the fringes of society.