The rise in popularity of "true crime" might seem sort of unusual, but the Internet has always had an obsession with things that are strange, creepy, or unexplained —and there's definitely nothing more unsettling than unsolved murder cases. Although most people are already aware of big crime stories like Natalee Halloway and JonBenét Ramsey, there have been many other cases that have flown under the radar.
The unsolved cases you hear about only make up a fraction of the crimes that are being reported. While not all the stories become tabloid news, the victims are just as deserving of the same national attention and outcry. And like most mysteries, they'll leave you with more questions than answers. Below, 11 cold cases that are simply chilling.