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France
Bourgogne-Franche-Comté
Besançon

By

Attractions and Places To See around By - Top 20

Attractions and places to see around By encompass a diverse landscape characterized by significant karst features, historical sites, and natural springs. The region features impressive caves, powerful underground rivers, and unique geological formations. Historically, the area played a role in salt production, with well-preserved industrial heritage. Visitors can explore a blend of natural wonders and cultural landmarks within this varied terrain.

Best attractions and places to see around By

  • The most popular attractions is Lison Spring, a cave that…

Last updated: May 9, 2026

Lison Spring

Highlight • Cave

At the source of the Lison, you will find a powerful waterfall, which never runs dry, a converted cave that you can enter and a turquoise blue swimming pool. All …

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Sarrazine Cave

Highlight • Cave

The Sarrazine cave is a real "wild cathedral" carved into the limestone. 100 meters high and 30 wide, the cave can be seen from afar.
Do not hesitate to approach …

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Royal Saltworks of Arc-et-Senans

Highlight • Monument

The Royal Saltworks of Arc-et-Senans is listed as a world heritage site by UNESCO. Built by Claude Nicolas Ledoux, a very renowned architect of the Age of Enlightenment, this factory …

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Salins-les-Bains

Highlight • Settlement

Salins-les-Bains is a city of character, fortified since Gallo-Roman times and surrounded by lush nature. If you like hiking or cycling, a trip to Mont Poupet is a must!

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Verneau Spring

Highlight • Cave

This is where the collection water from the largest cave system in the Doubs department comes from. Depending on the weather, sometimes more, sometimes less or not at all after a long period of drought.

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Downhill Distortion
July 1, 2025, Source du Verneau

a perfect place to recharge your batteries

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Remember not to venture too far into the cave

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Peter
October 5, 2024, Source du Lison

The spring is simply gigantic and there aren't too many tourists - at least when we were there.

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If you would like to visit the saltworks and the exhibitions in addition to the walk, you should plan at least 90 minutes.

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The Verneau is an underground river in the Franche-Comté Jura. It collects water from the Déservillers plateau and comes to the surface near Nans-sous-Sainte-Anne before flowing into the Lison. It is one of the largest underground rivers in France. During our visit, we found a notice saying that it is forbidden to enter the area around the spring or waterfall.

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This highlight is located on the plateau under which the cave opening is located. It can be found via a dead-end path, but the view is a bit sobering.

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The Sarrasine Cave impresses with its 90 m high portal. A 40 m thick layer of limestone separates it from the upper part of the plateau. The cave system has been explored for about 4 km, and hikers equipped with a flashlight can access it up to a small lake inside. https://www.lieux-insolites.fr

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Very beautifully laid out and developed. There are also interesting information boards, e.g. about the underground connection of the local springs. At the end of the 19th century, a mill owner wanted to divert the water from the spring, which, after intervention by the population and a member of parliament, led to the first French environmental protection law. https://www.montagnes-du-jura.fr/

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Frequently Asked Questions

What kind of natural attractions can I explore around By?

The region around By is rich in natural wonders, particularly karst features. You can visit impressive caves and powerful springs. Highlights include Lison Spring, known for its powerful waterfall and turquoise pool, and Sarrazine Cave, a massive grotto carved into limestone. Another significant natural site is Verneau Spring, the source of water from the largest cave system in the Doubs department.

Are there any historical or cultural sites to visit in By?

Yes, By has a rich history, especially related to salt production. You can explore Salins-les-Bains, a settlement with a long history of salt production, and the Royal Saltworks of Arc-et-Senans. Both are UNESCO World Heritage sites offering insights into the region's past wealth derived from salt.

What outdoor activities can I do near the attractions around By?

The area around By offers various outdoor activities. You can find numerous hiking trails, including moderate loops like 'Poupet Cross – Mont Poupet loop' and 'Mont Poupet – Wonderful view loop'. For cyclists, there are road cycling routes and touring bicycle options, such as the 'Bridge over the Loue – Royal Saltworks of Arc-et-Senans loop'. You can find more details on these activities in the dedicated guides for hiking, road cycling, and cycling around By.

Are there family-friendly attractions around By?

Yes, several attractions are suitable for families. Lison Spring is considered family-friendly, offering an accessible path to a beautiful waterfall and pool. The Royal Saltworks of Arc-et-Senans, a UNESCO site, also welcomes families, providing an educational experience about salt production.

What do visitors enjoy most about the natural springs and caves in By?

Visitors particularly enjoy the powerful waterfalls and the unique geological formations. At Lison Spring, the never-dry waterfall and the turquoise swimming pool at the foot of a spectacular cliff are highlights. For Sarrazine Cave, the sheer scale of its 100-meter high and 30-meter wide entrance, often described as a 'wild cathedral,' is a major draw.

Can I visit the Royal Saltworks of Arc-et-Senans and what makes it special?

Yes, the Royal Saltworks of Arc-et-Senans is a UNESCO World Heritage site and is open to visitors. It's special because it's a historic factory built by Claude Nicolas Ledoux during the Age of Enlightenment for salt production. The site covers five hectares and offers a fascinating look into 18th-century industrial architecture and the economic importance of salt.

What is unique about Salins-les-Bains?

Salins-les-Bains is a city with a rich history, fortified since Gallo-Roman times, and is also a UNESCO World Heritage site. Its uniqueness comes from its natural saltwater springs, which were used for salt production from the 8th century until 1962. The underground facilities, which can be visited with a guide, are particularly impressive and showcase the historical significance of 'white gold' to the region.

Are there any challenging outdoor activities or caves to explore for experienced adventurers?

For those seeking a challenge, Sarrazine Cave offers a more adventurous experience. While its entrance is easily accessible, venturing further into the cave can be tricky, especially after rain, involving climbing cascades past a cave lake. It's recommended to exercise caution and be aware of conditions.

What are the best viewpoints or scenic spots around By?

While not explicitly listed as a 'viewpoint' category for all, the sheer scale of Sarrazine Cave's entrance, visible from afar, offers a spectacular sight. Additionally, the 'Mont Poupet – Wonderful view loop' hiking route suggests scenic vistas in the area. The setting of Lison Spring at the foot of a spectacular cliff also provides a beautiful natural panorama.

What kind of geological features characterize the By region?

The By region is characterized by significant karst features. This means you'll find impressive caves, powerful underground rivers, and unique geological formations created by the dissolution of soluble rocks like limestone. The natural springs, such as Lison Spring and Verneau Spring, are prime examples of these karst phenomena.

Are there any less crowded alternatives or hidden gems to discover?

While popular spots like Lison Spring can get busy on weekends, visiting during weekdays or off-peak hours can offer a more tranquil experience. For a unique natural spectacle that might be less frequented, consider Verneau Spring, which is the collection point for water from a vast underground cave system and offers a feast for the eyes, even in bad weather.

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