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The original 13th-century wooden hall housed a royal courtroom on its upper floor where civil, judicial, feudal, and forestry cases were tried until the 18th century.

The Halle de Dourdan is a 19th-century market hall built in 1836 that replaced a medieval wooden structure dating from around 1228. Measuring 38 meters long and 14 meters wide, this impressive building features two pavilions at each end connected by a central aisle divided into seven bays. The hall serves as the heart of Dourdan's community life, hosting the weekly Wednesday and Saturday markets as well as annual festivals including the Medieval Festival in June and the Saint-Félicien Festival in September.

During the French Revolution, the church was converted into a "Temple of Victorious Reason" and later served as a prison until 1795.

A Catholic parish church dedicated to Saint Germain of Auxerre, positioned in the town center facing the castle on Place du Général-de-Gaulle. Construction began in 1150 under the canons of Saint-Chéron and was completed in the 12th century, though the building endured significant damage during the Hundred Years' War and Wars of Religion before being restored. The church has been classified as a historical monument since 1967 and measures fifty meters in length with its north spire reaching fifty meters in height.

The fortress once held up to 300 prisoners simultaneously, as recorded in revolutionary period prison registers when it served as a royal prison.

Dourdan Castle is a 13th-century fortress built by King Philip Augustus between 1220-1222, representing the pinnacle of "Philippian" military architecture with its square plan, defensive towers, and isolated donjon. The castle holds significant historical importance as the birthplace of Hugh Capet, the first Capetian king of France, whose father built an earlier wooden fortress on the site. Throughout its history, the castle served various roles including royal residence, hunting lodge, prison, and military barracks before being restored as a historical monument in 1964.

Until the 18th century, it supplied water to the village of Granges-le-Roi.

Ideal space for picnic