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Heritage classified

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Origin and history

The tower of Sermur, located in the Creuse department in New Aquitaine, is the only vestige of a feudal fortress destroyed at the beginning of the Hundred Years War. Its ruins, classified as historical monument in 1975, bear witness to medieval defensive architecture: a square plan, thick walls of 1.50 m at the base, and a lower floor without opening. The tower was based on a bevel-connected base, and its initial role was that of a watch tower integrated into the Marche defence system, a historical region on the border between Limousin and Auvergne.

In the 18th century, the tower of Sermur played an unexpected role in the history of science. In 1740, astronomer César-François Cassini used it as an observatory, and in 1797 Jean-Baptiste Joseph Delambre used it as a benchmark for measuring the meridian arch Dunkirk-Barcelona, a fundamental operation for establishing the metric system. These scientific uses contrast with its military origin, illustrating the evolution of the functions of historical monuments over the centuries.

Today, the remains of the tower offer a remarkable view of the surrounding landscapes, notably towards the Puy de Dome in the east and the plateau of La Courtine in the south. Despite its ranking, the restoration of the tower faces financial difficulties for the municipality of Sermur, aggravated by recent territorial reforms. The monument remains a heritage issue, linked to the development of cultural tourism, as evidenced by national archaeology days.

Architecturally, the tower is distinguished by its apparatus in rectangular rubble and the apparent absence of a vault between the ground floor and the first floor. Its base, or bahut, as well as the thickness of its walls, reflect a construction designed to withstand assaults. Although partially in ruins, it retains historical and symbolic value, both for its medieval past and for its role in the history of science.

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