From Italy comes a remarkable coincidence generations in the making—told with a little help from Airbnb.

Between 1850 and 1950, around 3.5 million Italians immigrated to Argentina, with the 19th century seeing mainly Northerners arriving, and the 20th century seeing mostly Southerners.

It contains the second-largest Italian diaspora on Earth by number, and the largest by concentration—with some states in Argentina today containing a population that’s 30% or more of Italian heritage, and it’s reflected in the culture and surnames seen today.

From that historic berth, Flor, a young Argentine traveler, made a reverse course this summer and arrived in Castel San Lorenzo, in the Italian region of Campania.

Her aim was to explore the place her father grew up—to see the countryside he left be

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