Start the tour outside the beautiful Church of Saint-Germain l'Auxerrois. Learn how the bell of this church marked the beginning of the St. Bartholomew's Day massacre in 1572. Stroll down nearby Rue Saint Honoré, which was once used as a location for the public execution of criminals. Hear about the many notorious crime figures in Paris' long history. Learn more about the notorious "Gang des Tractions" of the early 20th century. Hear the story of one of their leaders, Pierre Loutrel, who was France's first "public enemy number 1." The audio guide provides clear audio directions and a map indicates directions to follow in real-time. If you wish to take a break, simply pause the app and resume the tour when you are ready. The audio tour finishes at the Hotel de Ville, the City Hall of Paris, which also hosted public executions in years past.