On the Trail of the Golden Owl (translated from French) is a treasure hunting book written by Max Valentin (a pseudony…

The gravestone of John Renie is very unusual because of the inscription that carved on it takes the form of a grid, 19…

Cicada 3301, is the most mysterious and complex puzzle on the internet to recruit "highly intelligent individuals…

Kryptos, an encrypted sculpture created by Jim Sanborn which is located in a courtyard of the Central Intelligence Age…