1. Cathedral Saint-Louis de Blois
Perched on the high ground of the city, this cathedral commands the skyline with a blend of styles born from disaster and renewal. After a hurricane devastated the previous structure in the late 17th century, it was rebuilt in a Gothic style that feels curiously late for its time, thanks to the intervention of Louis XIV and Colbert. The nave is flooded with light, a sharp contrast to the gloomier interiors of older medieval churches, making the stained glass work by Dutch artist Jan Dibbets stand out even more vividly with its modern, symbolic designs.
Walking around the exterior, you can trace the history of the diocese, which finally gained independence from Chartres just as this building was rising from the rubble. The bell tower remains from the earlier Renaissance structure, a survivor that anchors the newer nave. Inside, the space feels open and airy, providing a calm retreat from the busy streets below. It is a functional place of worship rather than just a museum piece, so you will often find locals here for quiet reflection.
Most visitors stick to the château, but missing this cathedral means missing one of the most prominent Blois attractions on the north bank. The climb up through the steep streets of the old town to reach the forecourt is part of the experience, rewarding you with a sense of the city's vertical layout. Once you arrive, the atmosphere is distinctly more local and less frenetic than the tourist hubs near the river.