Richelieu is one of France's great planning curiosities — a 17th-century town built from scratch by Cardinal Richelieu to accompany his now-demolished château. Laid out in the 1630s by the architect Jacques Lemercier, it follows a strict classical grid: streets of identical townhouses behind uniform stone façades, grand gateways, and formal axes that still function exactly as designed nearly four centuries later.
The château that gave the town its reason to exist was demolished during the Revolution. But the town itself, designated a French Heritage site, survives intact. Walking its streets feels like inhabiting an architectural theorem — symmetrical, rational, and oddly beautiful for something so deliberately planned.
The 1,000-acre park that surrounded the château has been preserved as a public garden, with tree-lined avenues, canal sections for rowing, and rose gardens. It's an unexpected pleasure in a small Loire Valley town. Richelieu is a worthwhile detour for anyone touring the Touraine — both for the architecture and for the contrast with the organic medieval towns around it.