The Musée des Collections Historiques de la Préfecture de Police, also known as the Musée de la Préfecture de Police, is a fascinating museum of police history located in the 5th arrondissement of Paris, France. Situated in the Hôtel de police at 4, rue de la Montagne-Sainte-Geneviève, the museum is open daily except Sundays and offers free admission. Established by prefect Louis Lépine for the Exposition Universelle in 1900, the museum has grown over the years to house a vast collection of evidence, photographs, letters, memorabilia, and drawings that encapsulate significant events in French history. This includes famous criminal cases, conspiracies, arrests, and aspects of daily life in the capital such as traffic and hygiene. Visitors can explore exhibits that include a guillotine, uniforms, the pistol used in the assassination of Paul Doumer, and relics from the World War II occupation, including German machine guns and insignias worn by Jews. This museum offers a unique perspective on the history of France and is a must-visit for history enthusiasts and those interested in law enforcement.