The 20th century had its fair share of unexplained mysteries. Here are five of the most puzzling unsolved murders that stumped investigators.

The triangular Roswell Rock, discovered in September 2004, is magnetic with a raised design similar to a 1996 crop circle found in England.

A number of recent NASA photos have sparked our imagination and added to the mystery of the universe. What is NASA saying about them?

Die Glocke, or Nazi Bell, is allegedly some type of Wunderwaffe (wonder weapon) with anti-gravitational capabilities. Is the story a hoax?

The Superman Curse pertains to a series of tragedies that have occurred to individuals associated with the Superman franchise.

Akashic Records theory suggests that a universal database of all knowledge and experience can be accessed at any time by anyone for any reason.

ingenuity, curiosity, and courage are the key characteristics embodied by the famous Spanish explorer, Alvar Nunez Cabeza de Vaca.

After being stranded in the Antarctic ice, Ernest Shackleton knew how important staying active was when the habit of inactivity settles in.