Twenty or so sound and light shows around Chartres' heritageA free event offered every year since 2004 by the City of Chartres, which lasts from April to January, 7 days a week, from nightfall to 1am (10.30pm from 31 October). The event attracts more than a million visitors each year, but it also boasts internationally recognised technical expertise, thanks to the various artists and their scenographic work, which is resolutely focused on light, the cathedralon theatrethe media librarys, the bridges and washhouses and many other heritage treasures are explored, revealed and revisited.