When the photographer Nadar organized the first Impressionist exhibition in his Paris studio, in 1874, it was a response to the artistic establishment of the day, the Paris Salon, which had criticized and rejected a whole slew of gifted artists—among them, Claude Monet and Pierre-Auguste Renoir. To celebrate the movement’s 150th anniversary, the Historical Infantry Museum, in Rome, offers the chance to retrace the Impressionist movement through 160 rarely or never seen works from private collectors. It details how the word “Impressionism” began as a derogatory term, borrowed from the title of Monet’s 1872 painting Impression, Sunrise, but soon became a revolution in artistic expression. —Nyla Gilstrap