Riverdale road runs 11 miles between Thornton and Brighton Colorado, and legend has that it's one of the most haunted roads in America AND is home to the "Gates of Hell!" There are tales of a woman in white, ghost jogger, phantom Camaro, ghost children, and even flesh pedestrians! On top of all that, there's a whole slew of true crime that's taken place on this secluded road. 

Sources: 

https://apps.colorado.gov/apps/coldcase/casedetail.html?id=41

https://www.thedenverchannel.com/news/local-news/judge-finds-probable-cause-to-try-joseph-lopez-in-shooting-death-of-natalie-bollinger

https://thoughtcatalog.com/kacey-bradley/2018/04/8-facts-about-riverdale-road-the-most-terrifying-place-in-colorado-youve-never-been-to/

https://mix1043fm.com/the-most-haunted-road-in-colorado/

https://www.9news.com/article/life/style/colorado-guide/riverdale-road-thornton-haunted-ghosts/73-b5ead212-a2ff-44b1-8e5a-cfed45a7c828#:~:text=The%20winding%20road%20runs%20through,the%20%E2%80%9CGates%20of%20Hell.%E2%80%9D