On March 18th, 1990, two men disguised as police officers entered the Isabella Stewart Gardner Museum in Boston, USA and stole 13 works of art worth $500 million. It was the largest art theft in history, and the museum has offered a $10 million reward for information leading to the return of the works. This mystery has fascinated art lovers for years, and despite the FBI's best efforts, it remains unsolved. Read on to find out about the stolen works and how it happened.

A monster is typically depicted as a grotesque creature that possesses a destructive power that threatens humanity's social order or moral conduct. Within folklore, they are often portrayed as deformed, supernatural, mutant entities of the lowest class.

Do you fancy yourself as a puzzle solver? Here's your chance to try your hand at one of the internet's most difficult unsolved puzzles and join a mysterious top-secret club. Three puzzles were set, but one remains unsolved.