The etymology of the Rue Montorgueil reveals a past far less glamorous than the current reputation of the street. Proud Mount was just a pile of filth that the people had nicknamed derisively. Street that led to that bank, currently the site of Beauregard Street, has become the Rue Montorgueil in 1792. Between Les Halles and the Path, this street is now one of the best known and most pleasant of Paris. What are their secrets?