Mental Floss

MYSTERY

























Historica Graphica Collection/Heritage Images/Getty Images

In 'The Great Detective,' author Zach Dundas reveals that the frenzy surrounding Sherlock Holmes isn’t strictly a Benedict Cumberbatch-related phenomenon. The master of Baker Street has always inspired fanatical devotion and feverish anticipation.

David W Brown
iStock/BahadirTanriover

Was that mysterious "bloop" in the ocean made by a whale? Or by something much more mysterious? Investigators still don't know.

Caitlin Schneider
Wikimedia Commons

Kryptos, a set of huge copper plates with enciphered text carved into them, is an encrypted sculpture installed at CIA headquarters in Langley, Virginia. Although the sculpture was installed in 1990, it took until 1999 for someone to actually decrypt part

Chris Higgins
Insomnia Cured Here, Flickr // CC BY SA 2.0

There’s actually a whole group of people who enjoy the theory that Sherlock Holmes – or at least sidekick John Watson -- was real. The truth? Well that's elementary, my dear Watson.

Jason Plautz