In what years was the Napoleon III style popular?
Napoleon III style

Pavillon de Flore south façade by Hector Lefuel (1864–68)
Western façade of Pavillon de l'Horloge of the Louvre by Hector Lefuel
Gates of the Louvre by Hector Lefuel (1861)
Grand Salon of NapoleonIII apartments in the Louvre
Grand Salon of NapoleonIII in the Louvre.
Louvre Salon from NapoleonIII suite.
Dining room of NapoleonIII apartments at Louvre
