Read it and EEEP!
Atlas Obscura - Where you can find the spookiest places close to where you are right now. Looking for a creepy destination within walking or driving distance? This'll get you right where you want / don't want to be.
I bet you never thought of Toast as scary. Except for that link at The Toast that takes you to all kinds of free and freaky online stories, in order of scariness. Scroll to the last one and read it if you dare.
Heard of the Slender Man? What about creepypasta? If you have no idea what I'm talking about and want to sleep with all the lights on tonight, go here. This gave me goosebumps the first time I read it. And it's only the explanation of what creepypasta is. If you want to journey further down the rabbit hole, make sure to leave a trail of crumbs. Because we all know how well that worked out.
If you love both horror movies and reading (this is everybody, I hope), then you'll love this list of graphic novels for horror movie lovers from Panels. I am almost done with the Locke and Key series (excellent, highly recommend it) and have two of these other books on order. Want some more comic books for Halloween? NPR recommends four books here, including Neil Gaiman (how can you not include him?).