London's metropolitan police force has seen just about everything in terms of crime, and they've saved much of the evidence. A forward-thinking officer in 1874 began saving items from historic cases to show new recruits. The museum includes items like: Letters from the Jack the Ripper case, an oil drum used to dissolve murder victims in acid; Cannibal Dennis Nilsen's cooking pots; The umbrella-fired ricin bullet that the KGB used to kill a Bulgarian dissident in London during the Cold War; Items that once belonged to Charles Black, the most prolific counterfeiter in the Western Hemisphere, including a set of printing plates, forged banknotes, and a cunningly hollowed-out kitchen door once used to conceal them.

The museum houses evidence from some of the most twisted, barbaric criminal cases of recent history. It is not open to the public, as some people think it's just too gruesome for public viewing, but it is used as a teaching collection for police recruits. It also may show the monstrous side of humanity, what we have been and still are capable of doing to each other.