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The bell tower and nave were erected in 1150 to house the relics of Saint Martin. The choir and side aisles date from 1519. At the beginning of the 17th century, significant ornamental donations were added, as well as two altars in the side aisles dedicated to Saint Sebastian and the Virgin Mary. Major renovations were carried out in the 19th century: the choir vaults were completely rebuilt in 1859. The stained-glass windows date from 1871. A baptistery outside the building was built to the north of the first bay of the nave. The bays above each altar are built in the neo-Gothic style. The original decoration, dating from the 16th to 18th centuries, consisting of geometric elements in red, yellow, and black, has recently been restored. It is a tempera painting on a sand and lime plaster. It adorns the elevations and the vaults of the two lower sides.

The nave consists of a main nave and an aisle to the north. A bell tower is located to the south, as well as a seigneurial chapel. The choir consists of a straight bay and a semicircular apse. A first church was built in the late 11th and early 12th centuries by Étienne de Denonville. It was modified in the 16th century by Pierre de Hémard. A seigneurial chapel was built shortly after the death of Jacques de Hémard, Lord of Denonville, in 1559. On the old vault, in 1658, one could still see "the coat of arms and blazons of the Hémard family, which are six sable burels, around which are the hat and cords of a cardinal from the family." The vault was rebuilt by the Brisay family in 1722. A project to extend the church was considered in 1755 but never carried out. The north aisle was built in 1770.

According to tradition, the church choir covers the remains of an older building, possibly dating back to the 6th century, which was built to house the saint's body. According to current knowledge, the commune of Saint-Piat (Sanctus Piatus in Latin) officially appeared in 1087, mentioned in a charter of the Nottonville Priory (Eure-et-Loir), on which it depended. The current building was rebuilt during the time of Francis I, as suggested by the date 1535 engraved on two buttresses of the apse and the date 1542 engraved on a piece of wood from the vault. This is according to a study by the SAEL (Eure-et-Loir Archaeological Society). The three-sided apses, the dripstone towers (horizontal members projecting from a wall), and the sculpted roof structures are a testament to the importance of the reconstructions carried out in the department during the 16th century. The church of Saint-Piat is one of them. While the church has not been officially recognized, it nevertheless contains objects that have attracted attention both for their antiquity and quality, but not always for good reason. Their artistic value, far from attracting only religious or aesthetic interest, has also aroused a covetousness that, unfortunately, remains for some of them. Fortunately, those still in place are carefully cared for and offer the curious a story to discover, a beauty to slowly ponder as they progress toward the choir.

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.

Pretty building at Bordes which forms the entrance to the castle.