The Night of Museums is returning this year on Saturday, May 23, 2026, in Paris and the Île-de-France region for its 22nd edition, offering a lineup of exceptional late-night openings—many of which are free—across the city and surrounding areas. Spoiler alert: there's something for everyone, including train and transport enthusiasts. And right here, discover the exciting lineup of events waiting for you this year at the railway museums across Paris and Île-de-France.