Criminal investigators, journalists, and authors have considered some heists, hijackings, and even murders as “perfect crimes.” In these instances, the criminals left no evidence at the scene, or the execution of the crimes prevented authorities from ever solving the cases. A "perfect crime" is an unsolvable crime, but not due to any incompetence of investigators. The term delineates a criminal action in which the perpetrator deliberately left no evidence behind - and in extreme cases, the crimes themselves are undetectable.
Unsolved robberies - whether the target is a bank, museum, or jeweler - can reflect orchestrated schemes out of a movie like Ocean’s 18. Unsolved murders, particularly those that involve unidentified serial killers, may reflect the time period’s limited forensic capabilities. In other instances, the murders are unsolvable due to lack of evidence, motive, and even a body.
These 18 well-known crimes reflect the actions of robbers and murderers whom police will likely never identify - and capture.