The best road cycling routes around Dourdain

Old church mentioned as early as 1160 and rebuilt in the 16th and 17th centuries (old tower dated 1582). The current church was entirely built to the plans of Arthur Regnault in 1904 (date and attribution by source). He uses the model of the so-called Plantagenet vaulted ceiling for the covering of the nave and aisles, but for the bell tower, he draws inspiration from Cornish bell walls. Two windows from the late 15th and 16th centuries of the old church were reused on the south side of the nave. This church, rebuilt in the Breton flamboyant style, is representative of the architect's style during this period.

The bell tower is visible from afar and has long dominated the town and its surroundings. The Saint-Pierre church has retained its impact on the local landscape for over a century. It was indeed in 1888 that the Fabrique Council decided to entrust Arthur Régnault, the diocese's architect, with the project for a new construction. His plan was accepted and work began in October 1889, before the blessing of the first stone on March 13, 1890. As an anecdote, the stones are extracted from the quarry of La Bouëxière. Quickly, the inhabitants discovered its citadel-like appearance, Arthur Régnault having wanted to honor the city of Châteaubourg which had not had a castle for a long time! The structural work was completed on March 28, 1893, but due to lack of funds, the bells would wait until 1894. The work on the woodwork and the construction of the high altar took place in 1911, the church being due to host the important Eucharistic congress of 1913. Maintenance work continued over the years, the church having become the property of the municipality since 1905. During the bombings of the summer of 1944, the church was spared. The inhabitants would not forget it: on May 9, 1945, the day after the armistice, the men carried Notre Dame de Boulogne in procession and paraded barefoot through the streets. The centenary was celebrated in 1992 with the decision to install the current organ. The church of Châteaubourg has thus traversed local history from the 15th century – the date of construction of the previous, much smaller church – to that designed by Arthur Régnault.

The church of Saint-Sulpice (17th century). Dedicated to Saint Sulpice, bishop of Bourges, the church of Ossé consists of a single nave ending in a straight chancel, to which two chapels have been added, forming the transepts. It has no style and may partly date back to the 16th century, as indicated by the ogival window of its chancel, now walled up. The North chapel, dedicated to the Virgin Mary, and originally reserved for the lord of Charot, was built in 1611. The other chapel, dedicated to Saint Nicholas, also seems to be from the 17th century. Le Plessix d'Ossé was the manor house of the parish. In 1440, Duke Jean V settled a dispute concerning the right of burial in the church of Ossé between the sieur du Pan, lord of Plessix, and the sieur de Montbeille, lord of Grées. The ecclesiastical superiority belonged to Ossé to the baron de Châteaugiron, but the lord of Plessix enjoyed the rights of founder and patron; this was declared in 1694 by Gabrielle Glé, marquise de la Vallière and lady of Plessix (National Archives, P. 1721). Jacques Le Prestre, baron de Châteaugiron, having acquired Plessix in 1744, took possession of all these honorary rights and had his coat of arms placed in the choir and on the high altar of the church of Ossé. As for the lord of Charot, he had his tomb, his pew, and his coat of arms in his reserved chapel. The bell tower dates from 1899. The altarpiece of the Holy Trinity dates from the 17th century.

The Jardin Public is centrally located in the city and extends over several terraces offering sweeping views of the old town and the Château de Fougères. Created in 1865, the park combines features of an English landscape garden, French garden architecture, and botanical design.

The Église Saint-Léonard was built in the 12th century and acquired its present form in the flamboyant Gothic style in the 15th and 16th centuries. During the French Revolution, the church was deprived of its sacred function, but in the 19th century, under architects such as Aristide Tourneux, it underwent extensive renovations, including a new main façade with a large rose window. Inside, 19th-century stained-glass windows depicting episodes from the life of Saint Léonard can be seen.

The cadastral records of the Château Fort de Fougères mention two towers—the Tour Raoul and the Tour Surienne (also called "tour de Surienne")—dated between 1480 and 1485. The tower was part of the fortifications that were reinforced or rebuilt in the 15th century.

The Tour Surienne was named after Françoise de Surienne. In March 1449, in the midst of a truce between France and England, François de Surienne, a Spanish mercenary in the pay of the English, attacked in the dead of night with his 600 men. The inhabitants were slaughtered and the city plundered. In 1450, Surienne settled there and entrenched himself. Only after a two-month siege by Francis I, Duke of Brittany, who was aided by a plague epidemic, did Surienne surrender.

The largest fortress in Europe, the castle of Fougères stands on a rocky outcrop surrounded by marshland. The first castle of Fougères was built around the turn of the millennium to defend the north-eastern part of the border area of the Duchy of Brittany. Built at the crossroads of important trade routes, this primitive fortress had the main objective of monitoring the powerful neighbors and preventing their raids on Breton lands. To the north, Normandy belonged to the kings of England at the time.