The graphic novel 'From Hell' by Alan Moore is also a notable horror - themed work. It delves into the Jack the Ripper murders in Victorian London, exploring not just the killings but also the social and political context of the time. The art is moody and helps to create a very spooky atmosphere.
For beginners, 'The Sandman' by Neil Gaiman is a great pick. It has a very accessible story that draws you into a rich and magical world. The art is also very good at setting the mood. It's a story about dreams and the entities that inhabit them, which is both fascinating and easy to get into.
One great non - Marvel or DC graphic novel is 'Persepolis' by Marjane Satrapi. It's an autobiographical story that gives a very personal view of life in Iran during and after the Islamic Revolution. The art style is simple yet powerful, and it really helps to convey the complex emotions and experiences of the author.