Dating back nearly 12,000 years, history's oldest man-made structures provide valuable insight into the first steps of civilization.

From Alexander the Great being buried alive to a Jameson heir paying to watch a girl be cannibalized, these true horror stories go way beyond Rated R.

Whether it's serial killers, cannibals, or disturbing beasts, the only thing more chilling than these scary photos from decades past are the terrifying stories behind them.

From the true story behind The Conjuring to the murders that inspired The Amityville Horror, these real ghost stories might make even the skeptics believe in the paranormal.

Discover the strangest photos ever taken in this collection of bizarre animals, unusual inventions, and extraordinary events that are completely one of a kind.

On February 16, 1981, 19-year-old Arne Cheyenne Johnson stabbed his landlord Alan Bono to death with a pocketknife — then said the Devil made him do it.

From "Cannibal Holocaust" to "The Blair Witch Project," these movies were so extreme that countless people thought the onscreen carnage was real.

Cindy Hendy wasn't just David Parker Ray's girlfriend throughout his dozens of murders as the "Toy Box Killer" — she was also his accomplice.

Go inside the most terrifying serial killer movies of all time — and the even grislier real-life murderers who inspired them.

A year after Ronald DeFeo Jr. shot and killed six of his family members at 112 Ocean Avenue, the Lutz family moved in and began experiencing unexplainable hauntings that would inspire The Amityville Horror.

When police raided serial killer John Wayne Gacy's house at 8213 West Summerdale Ave. in Chicago's Norwood Park in 1978, they uncovered 29 bodies.

In May 1983, Diane Downs shot her three children before shooting herself in the arm to stage being attacked by a carjacker, but her plot failed when two of her children survived.