The 620-page Codex Gigas stands nearly 36 inches high and may have taken 25 years for a single monk to write.

Since 1997, at least 45 young men have mysteriously disappeared after a night at the bar only to be found dead in a nearby body of water — and some believe the shadowy Smiley Face Killer is to blame.

On June 6, 1996, Damon and Devon Routier were murdered in the suburban Texas town of Rowlett. Their mom, Darlie Routier, was found guilty and sentenced to death a year later, but has maintained her innocence ever since.

Built in 1914, Pittock Mansion was nearly razed to create a subdivision in the 1960s before Portland residents came together to save it.

Jacob's Well Natural Area is a park outside of Austin, Texas, with a water system that goes at least 4,500 feet underground — and has killed at least nine people trying to explore its depths.

The Jamison family of Eufaula, Oklahoma disappeared on October 8, 2009, and though their bodies were found four years later, their case remains a mystery.

Soon after appearing in "Scarface," actress Tammy Lynn Leppert disappeared from Cocoa Beach, Florida on July 6, 1983 at the age of just 18.

Ever since two artists erected Prada Marfa in the Texas desert in October 2005, this daring installation has taken on an unexpected life of its own.

James Buchanan, the only president to remain a bachelor his entire life, may have also been the first gay president in U.S. history.

Genene Jones was only convicted for one murder and one attempted murder of a child, but evidence suggests she may have killed dozens more during her time as a pediatric nurse.

Before Jack the Ripper terrorized London, Spring-Heeled Jack was tormenting citizens with his claws and tight-fitted clothes.