Typically, when you think of movies about Wyoming, old westerns come to mind. And while the Cowboy State has inspired many tales of rugged, frontier justice, it's also been the setting for some of the creepiest science fiction thrillers and horror films ever made.

Here's our list of the five creepiest movies ever set in, filmed in, or inspired by Wyoming.

1. Natural Born Killers - This 1994 Oliver Stone film starred Woody Harrelson and Juliette Lewis as Mickey and Mallory Knox, two young lovers who embark on a cross country killing spree. Did you know, it was inspired, in part, by a real life couple that was captured here in Wyoming?

In 1958, Charles Starkweather and his thirteen year old girlfriend Caril Ann Fugate killed eleven people across the state of Nebraska, including Fugate's mother, stepfather and sister. They were eventually captured in Douglas, Wyoming, before being extradited to Nebraska and tried on murder charges.

The story also inspired two other films, The Sadist and Badlands.

2. The Prison - Filmed at the old Frontier Prison in Rawlins, this 1987 horror film follows an inmate who was executed for a crime he did not commit. Years after his death, the inmate comes back to life and slaughters the men responsible for his execution.

Not only did the film feature several area residents as extras, the execution chamber depicted in the movie is the actual gas chamber from the old prison.

3. The Vanishing - Kiefer Sutherland starred in this 1993 thriller about a man searching for his recently abducted girlfriend, played by Sandra Bullock. After a man, portrayed by Jeff Bridges claims responsibility, Sutherland sets out in search of his lost love in Wyoming.

4. Starship Troopers - This 1997 science fiction farce isn't really that scary. However, it does feature giant insects from the planet Klendathu, which was filmed at Hell's Half Acre near Casper.

5. Close Encounters of the Third Kind - Arguably the greatest movie ever filmed in Wyoming, this epic Steven Spielberg sci-fi flick famously features the Devil's Tower National Monument as the backdrop for its tale of alien abduction.

Honorable Mention - Endangered Species - This 1982 movie, filmed in Buffalo, starred Robert Urich as a New York cop investigating a series of cattle mutilations in the west.