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Auvergne Rhône Alpes
La Tour-Du-Pin

Trept

Attractions and Places To See around Trept - Top 20

Best attractions and places to see around Trept include a variety of historical sites, natural landscapes, and cultural points of interest. This region in France offers more than 20 notable places to explore. Visitors can discover medieval towns, historic castles, and serene natural areas.

Best attractions and places to see around Trept

  • The most popular attractions is Crémieu, medieval town, a historical site known for its architectural heritage. Its narrow streets reveal the Delphinal castle, a 16th-century hall, and…

Last updated: May 5, 2026

Étang de la Rosière

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left a little too late to see the sunrise on the heights of Plan Bourgoin

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Chateau de Chapeau Cornu

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You don't need to go inside the castle to appreciate its beauty.

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Château de Bienassis

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The Château de Bienassis in Villemoirieu, near Crémieu, was frequented by Alphonse de Lamartine.

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Cingle Castle

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Listed as historical monuments: pop.culture.gouv.fr/notice/merimee/PA00117311

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Crémieu, medieval town

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This small city of character, located 40 kilometers from Lyon has a sumptuous architectural heritage. Walking through its narrow streets, you will discover the Delphinal castle, its majestic 16th century …

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Jacques
September 20, 2025, Le château de Chapeau Cornu

Found somewhat by chance and at a very affordable price, this hotel restaurant is a superb stopover for a bike ride!

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Beautiful little town, quite touristy, but worth the detour

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Lovely view of the pond. A little cool spot when it's hot.

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Although first mentioned in 1540, the Cingle fortified house was undoubtedly built in the second half of the 14th century by the Pèlerin family. Originally composed of a main tower and a wing back to the west, it perhaps originally included a curtain wall. During the 15th century, the south wing was extended towards the west, a main building comprising a lower room and an upper room was attached to the north of the main tower, while a turret occupied on the first floor by an oratory and on the second by a dovecote is built to the east, projecting. A wing including the kitchen on the ground floor is also built at right angles to the north of the courtyard. The farm itself retains some architectural elements dating from the 16th century. Source: Ministry of Culture

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The Bienassis fortified house, built by the Vallin family at the end of the 14th century, was organized around an enclosed courtyard and included a pavilion surrounded by watchtower turrets. The current building was completed in 1897 for Casimir Gournet, who wanted to give the old feudal residence the appearance of a medieval castle. Alphonse de Lamartine made several stays in Bienassis with his friend Nicolas Prosper Guichard, between 1804 and 1808. The castle, built of limestone rubble, consists of an L-shaped building covered with a long-pitched roof covered with mechanical tiles extended to the south by a high quadrangular tower with a porch in the work. The north wing has four levels of elevation: three cellars on the basement floor, a square floor and an attic floor. The tower rises on three levels: a ground floor with ribbed vaults and two square floors, the buildings are crowned with false machicolation. The corner turrets are covered with conical slate roofs. The stained glass windows of the ground floor living room are decorated with two bust-length women and two bust-length men in rondels. The coat of arms of the Joubert de Montlevon family can be found on one of the windows of the first living room on the ground floor. In the library, two shields with scrolling scroll motifs, a shield decorated with three female heads, a shield decorated with a passing griffin, and a shield decorated with two hammers with the initials C G for Casimir Gournet adorn the windows. Source: Châteaux de France

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Chapeau Cornu Castle was originally a fortified house built on the site of an ancient Roman camp. Between 800 and 1100, feudalism took hold. The sovereigns of Vienna and the Bishop created “rear fiefdoms” to ensure security and repel attackers. In the 12th and 13th centuries, there were two allied families: the Capellas and the Cornutis. It is by derivative of these 2 Latin names that “Chapeau Cornu” was born. In 1300, Amédée de Rossilon was governor of Chapeau Cornu. He left this property to his nephews Pierre and Louis Chapel. After Pierre's death in 1358, Louis succeeded him. Pierre will leave 2 daughters, one of whom Antonia marries the Knight Etienne Laure, Lord of Veyssillieu. The latter was killed by the English while fighting under Duguesclin. His son Jacquemont Laure avenged him and his daughter Béatrice married Imbert de Groslée, Seneschal of the King, in 1413. His sons and descendants remained in Chapeau Cornu until 1650. It was in 1601 that Chapeau Cornu took the name Château. But in 1638, the Castle fell into disuse. The last occupants, the Matthieu de Rame couple, left no children and in 1693, the property passed to Aymard Micha de Burcin. He expanded the estate through multiple purchases and died in 1755, donating all his property to his cousin Philippe Guillaume de Grammont. After the storming of the Bastille on the night of July 25 to 26, 1789, “the great fear” began. A band of rioters, determined to destroy the property of the squires, arrived in Chapeau Cornu at 1 a.m. The steward at the time had the idea of treating them as guests and opened the doors of the wine cellars to them. The damage underground is impressive: the undrinked wine is emptied but the castle remains intact. After the Revolution, the castle was purchased by Jean André Barge from the de Certeau family. He diverted the bed of the stream coming from the hill which then passed into the castle. He had the large buildings to the south-east and east built on the vault. Ruined, he sold part of the land to people from Vignolles. In 1855, the castle and 80 hectares surrounding it were bought by his son Ferdinand de Certeau. The estate remained in the family until 1891. The Bourgoin Court then ordered a judicial liquidation and had the property sold in several lots. Source: Vignieu website

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Nice view of the Chapeau Cornu castle from the road.

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Rosière Pond NATURAL HERITAGE Rosière Pond BACK TO THE LIST Rosière Pond© Martial-Couderette The Rosière pond is located to the north-east of the town of Bourgoin-Jallieu on the edge of the town of Ruy-Montceau and offers an ideal relaxing setting. The association “Les Amis de Rosière et de la Nature” manages the pond made available by the city. The Rosière pond, fed by the Loudon stream, was built in the 18th century to power a hemp mill (the current restaurant). This pond was the property of the GENIN family for a long time before being bought by the town of Bourgoin-Jallieu in 1978. Since then, the town of Bourgoin-Jallieu has done everything possible to make this site a protected natural place, walks and hikes and a fishing spot. Many hiking trails start from the pond. Source: Isère Tourism

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Frequently Asked Questions

Are there family-friendly attractions around Trept?

Yes, several attractions are suitable for families. The Étang de la Rosière is a protected natural area with walking paths and a relaxing setting, perfect for a family outing. The medieval town of Crémieu also offers a captivating historical experience for all ages with its narrow streets and ancient buildings.

What kind of historical sites can I visit near Trept?

The region is rich in history. You can explore the medieval town of Crémieu, known for its architectural heritage, including the Delphinal castle and a 16th-century hall. Other notable historical sites include the Chateau de Chapeau Cornu, a fortified house dating back to the 12th century, and the Cingle Castle, a 14th-century fortified house listed as a historical monument.

Are there natural landscapes or lakes to visit?

Absolutely. The Étang de la Rosière is a beautiful natural lake, fed by the Loudon stream, offering a serene environment for walks and hikes. It's a protected natural place where many trails begin, providing a peaceful escape into nature.

What outdoor activities can I do near these attractions?

The area around Trept is excellent for outdoor activities. You can find numerous routes for running, cycling, and road cycling. For running, explore trails like the moderate 'Clear Lake loop from Trept'. Cyclists can enjoy routes such as the 'Crémieu–Morestel Greenway' loop. For more options, check out the dedicated guides for Running Trails, Cycling, and Road Cycling Routes around Trept.

Are there easy hiking trails around Trept?

Yes, many hiking trails start from the Étang de la Rosière, offering various difficulty levels. While specific easy trails are not detailed, the pond itself provides a relaxing setting for walks. For more structured hiking options, you can explore the 'Running Trails around Trept' guide, which includes moderate routes like the 'Clear Lake loop'.

What do visitors enjoy most about the attractions in Trept?

Visitors particularly appreciate the rich architectural heritage of the medieval town of Crémieu, noting its pleasant atmosphere and historic buildings. The natural beauty and relaxing setting of the Étang de la Rosière are also highly valued for walks and enjoying nature.

Can I visit castles in the Trept area?

Yes, the region features several historic castles. The Chateau de Chapeau Cornu, originally a fortified house, has a long history dating back to the 12th century. You can also see the Château de Bienassis, a fortified house from the late 14th century, and the Cingle Castle, another 14th-century fortified structure.

Are there any viewpoints or scenic spots?

The Étang de la Rosière is listed as a viewpoint, offering lovely views of the pond and its natural surroundings. Additionally, the Chateau de Chapeau Cornu provides a nice view from the road, allowing you to appreciate its historic architecture.

What is the best time to visit Trept attractions?

While specific seasonal recommendations are not provided, the natural settings like the Étang de la Rosière are generally pleasant during warmer months for outdoor activities. Historical sites like Crémieu can be enjoyed year-round, though spring and autumn often offer comfortable weather for exploring.

Are there challenging walks or cycling routes in the area?

Yes, for those seeking more challenging outdoor activities, there are difficult-grade routes available. For running, consider the 'Étang de Fenières – Étang Bouvet loop from Trept' (22.5 km). Cyclists can tackle routes like 'La Vanne d'Optevoz – La Roche Waterfall loop' (50.5 km). Road cyclists have options such as the 'Portes Pass – Col de Portes (1010 m) loop' (84.2 km). More details can be found in the respective Running, Cycling, and Road Cycling guides.

Are there any hidden gems or less-known places to explore?

While the main highlights are well-known, the historical context of sites like Cingle Castle, a 14th-century fortified house, offers a deeper dive into the region's past beyond the more prominent attractions. Exploring the smaller villages and their local heritage around Trept can also reveal charming, less-traveled spots.

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