Standing in the main courtyard of the CIA headquarters in Langley, Virginia is an impressive unsolved encrypted sculpture called Kryptos.

Nov 28, 2011 - Jenny Kile

Alleged UFO sightings have always caused a split opinion. This is a look at a few of the myths and tales.

Jan 20, 2011 - Samantha Sands

Livescience magazine has released a list of its top 10 (as yet) unsolved mysteries. See if you agree:

Jan 23, 2007 - Jodee Redmond

Hadrian lay dying at his palace at Baiae, Naples. His slaves refused to stab him in the place he had found beneath his heart. He left five lines that defied translation.

Nov 5, 2009 - Duncan McGibbon

Connected to an unidentified man found dead on Somerton beach in 1948 is a code which could provide clues to the man's name if it can be solved.

Nov 13, 2011 - Jenny Kile

There have been reports of UFO sightings dating from 1886 to the most recent twin spotting incidents in China in 2010.

Sep 4, 2010 - Imad Rahim

One of the most baffling crimes in British history took place in a quiet Liverpool neighbourhood in 1931.

Apr 25, 2011 - Rupert Taylor

Who killed the Black Dahlia? Where is Jimmy Hoffa's body? Who was the Zodiac Killer? These questions are to this day without any definitive answers.

Nov 27, 2007 - Scott Hayden

Some murders are famous, and some go unsolved. When famous murders go unsolved, they become legendary. Here are five famous unsolved murders.

Jul 20, 2010 - Christopher Minster

Do you want a challenge or want to solve a mystery? After 12 years a murder remains unsolved and the FBI has asked for help to crack the code.

Jul 25, 2011 - Jenny Kile

The torso of a woman discovered off I-70 in Wright City, Missouri, remains unidentified. Can you help identify her?

Jun 28, 2011 - Erika Lyn Smith

The historical mystery combines a reader's interest in the past with an interest in solving puzzles that goes beyond the traditional detective novel.

Jun 29, 2010 - Kelly Clody

When life presents dark moments and true depression is not the cause, a time of transformation may be possible. Spiritual growth could be the ultimate gift.

May 11, 2010 - Teri Clifton

The lights are visible on clear nights near Marfa. There was fear and superstition in the past. Now the lights are a major tourist draw, a mystery of science.

Jun 11, 2007 - Jill Stefko

A huge area of the Atlantic anchored by Bermuda, Puerto Rico, and Florida has acquired an undeserved reputation for strange events.

Sep 14, 2009 - Rupert Taylor

Four centuries before Christopher Columbus sailed across the Atlantic from Spain, Leif Ericsson (c. 970-1020), a Nordic explorer, landed on the shores of North America.

May 23, 2009 - Monica Resendes

British Mystery author Robert Goddard's thrillers keep readers enthralled. His suspenses have been compared to Daphne Du Maurier, John Le Carre, and Barbara Vine.

Jan 21, 2008 - Vickie Britton

Serial killers, psychopaths, stalkers. They are all around us. They intrigue, repulse, fascinate and frighten us.

Feb 19, 2011 - Sue Raines

In 1977, Wakefield, NH was the scene of a mysterious occurrence. A perfectly round circle appeared in a frozen pond. Was it the site of a UFO landing?

Jun 21, 2010 - Andrea Ruiz

Explore the treasures of the British Museum with popular manga character Professor Munakata.

Nov 9, 2009 - Lito Apostolakou