This killer's crimes will leave you with nightmares.

Prepare to be royally creeped out.

Get ready to lose some sleep.

From cemeteries to genocide museums, these locales will freak out any visitor.

Nikolai Dzhumagaliev dismembered and consumed at least seven victims.

Whether you believe or not, these stories will give you the chills.

This hotel hid secrets and bodies within its walls.

"I woke up to see a man covered in blood standing in the middle of the living room..."

"I will never experience anything as creepy and terrifying..."

Sweet dreams.

Constanzo was convinced he could protect his criminal operation through ritual murder.

Who knows what’s lurking just out of sight?

He seemed have everything going for him ... but darkness lurked beneath the surface.

Don't let him in.

These bizarre cases will send a chill down your spine.

Bizarre, inexplicable, and downright chilling.

Good luck getting a good night's sleep...