Chartres en Lumières
If you need an incentive to linger here until dusk, "Chartres en Lumières" (Chartres's festival of lights) provides it: 28 of the city's most revered monuments, including the glorious Notre-Dame Cathedral, are transformed into vivid light canvases. Thematically based on the history and purpose of each specific site, the animated projections are organized into a city walk that covers a wide swath of the Old Town's cobbled streets and bridges. The spectacle is free and occurs nightly from sunset to 1 am from late April through mid-January. A train tour of the illuminated city operates several times a night from May through September.
