The Fortress can be visited
Fort Balaguier

The Fort de Balaguier or Fort Balaguier is a military structure located in the commune of La Seyne-sur-Mer (Var, France). It was built in 1636 with the aim of protecting the Toulon roadstead from intrusions. Its construction was decided and undertaken after an inspection of the Provence coasts by Henri de Séguiran, first president of the Parliament of Provence and lieutenant of the Grand Master of Navigation, Cardinal Richelieu. The aim at the time was to counter the belligerent intentions of the House of Habsburg in the Mediterranean. At the same time, Richelieu had a series of defensive towers built on the coasts of Provence from Antibes (Grillon Tower) to the Embiez Island (Sainte-Cécile Tower), including the Hyères Islands.
History of the Fort+
Its creation, in the first half of the 17th century, corresponded to a strategic imperative: to prohibit access to the Toulon roadstead, which the Royal Tower alone could not guarantee. Indeed, the distance between the two structures, which controlled the entrance to the small Toulon roadstead, was 1,350 meters, while the maximum effective range of artillery was around one thousand meters. A few years later, in 1673, the fort's defenses were reviewed and improved by the naval engineer Gombert, on the eve of the war against Holland (addition of two open-air batteries). During his inspections of Toulon (1679, 1700 in particular), Vauban was critical of the structure, which he considered poorly protected against a surprise attack from land. He proposed a project to improve the tower and its enclosure, which was not carried out. In 1793, after the city of Toulon surrendered to the British, the fort was the scene of fierce fighting between the soldiers of the Republic, led by Bonaparte, and the British.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Hervé Rebours
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 43.0943, 5.9110