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Origin and history

The Geisberg castle was built between 1692 and 1714 by Jean Gaspard de Hatzel, an anobli bourgeois, on the dominant heights of Wissembourg. The architect Rondouin designed a complex consisting of a main residence, two garden pavilions, and agricultural buildings, all surrounded by a large park. The land was exploited by Swiss Mennonite farmers, whose descendants still live on the site today. The estate also included a chapel dedicated to Saint Martin, served by the Augustins of Wissembourg.

In 1755 the castle was sold to Philippe Michel Weber, who kept it until the Revolution. The site became a strategic issue during the conflicts of the eighteenth and nineteenth centuries: it was the scene of violent fighting in 1793 between the French revolutionary troops and the Austrian-Prussians during the Battle of Wissembourg, then in 1870 during the Franco-Prussian war. These battles caused considerable damage to the castle, already weakened by successive wars.

In the 20th century, the castle, which was evacuated in 1940, was burned down and razed in 1947 to give way to houses and a church. Today, only the Porch Tower, the guardian's house, the ruins of the pavilions, and a dovecote dated 1711 remain, inscribed in historical monuments since 1990. The dovecote, transformed into a Mennonite hall of worship in 1850, bears witness to the religious and agricultural history of the estate. The remains also recall the destructions of the wars, especially that of 1870, where the Geisberg was a key point of the clashes.

The estate, initially organised around a courtyard and a garden, presented a symmetrical architecture with a central body flanked by wings in the pavilion. The front door, surmounted by a pediment and a bell of 1714, as well as the twin coat of arms, emphasized its prestige. After 1947, the Mennonites partially rebuilt the site, erecting a chapel there in 1973. The family archives and original plans, perhaps preserved by a descendant of the architect in the United States, remain potential sources for reconstructing his history.

Today's protected elements, such as the tower, the guard's house and pavilions, illustrate the evolution of the site, marked by its military role, its Mennonite agricultural heritage, and its architectural transformations. The original well, still visible in the garden of a modern house, and the remains of the basement recall the past breadth of the castle, symbol of the social and political dynamics of Alsace in the 17th–12th centuries.

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