Death of the last Baron de Fleckenstein, Henri­Jacques, leaving no male heir.

The Fleckenstein is sold as a Bien National.

The Napoleonic Brigadier General Olivier Harty, Irish by extraction, purchases the ruins of the castle to acquire the title that goes with it. He translates the title into French and so becomes the Baron de Pierrebourg. The ruins and the lands of the castle are in future in separate ownership.

The German Sous­Préfet of Wissembourg, von Stichaner, makes it possible to visit the castle. Thanks to the development of the railway the castle gradually becomes a noted landmark for hikers.

The Fleckenstein is listed as a historic building.

Setting up of the Syndicat d'intiative of Lembach with the renovation and development of the Fleckenstein as a main project. The site association manages the castle until 2005.

Archeological excavations on the platform at the top of the castle : filtration cisterns, keep, kitchen area.

Major works to make the structure safe and to consolidate the ruins (new guard rails, spiral staircase, facing wall, flanking towers on the south wall, etc.)

The Alsace Region purchases all the land on which the castle stands and grants it to the Commune of Lembach.

Renovation of the old farm buildings to receive the public (ticket office, café, shop, parking in the forest) and the opening of the cross border promotional centre 'the P'tit Fleck' by the Community of Communes of the Vallée of the Sauer.