The Crime Museum Uncovered, Museum of London

Ever heard of the Crime Museum? This secret stash of horrifying memorabilia from the most famous crimes in British history is the Metropolitan Police's best kept secret. For the first time visitors get a rare look at these objects at the  Museum of London Crime Museum Uncovered exhibition, which have previously only been seen by the police and invited guests like King George V, Sherlock Holmes author Sir Arthur Conan Doyle and illusionist Harry Houdini.
What is the Crime Museum?
Currently to be found in New Scotland Yard at the Met's HQ, the 'Black Museum', as it was dubbed by the Observer when journalists were denied entrance in 1877, is a sinister warehouse set up in 1875 to house the police's collection. It was originally designed under The Prisoners Property Act of 1869 and was used as a teaching tool for young police officers to detect and prevent burglaries. 
Inspector Neame, with the help of a P.C. Randall first collected enough objects to fill the museum, which is today made up of two rooms  of weapons and death masks of people hanged at Newgate Prison on the top shelves. Crimes ranging from hostages, hijacking and robbery to famous murders and poisonings are remembered in this bizarre display of case material from the Great Train Robbery of 1963, the Acid Bath Murderer of 1949 and the Millennium Dome Diamond Heist in 2000. 
Museum of London exhibition 2015
Step into the frightening world of these famous crimes and discover the challenges of modern day policing in the big smoke, from terrorism and espionage to counterfeiting and drug trafficking. This show also uncovers a personal insight into the victims, the effects on society and our morbid fascination with crime.