The palace of the island is a former stronghold of the xii ^th  century, rebuilt several times, located on an island formed by the Thiou , which stands on the town of Annecy in the department of Haute-Savoie , in the Auvergne-Rhône-Alpes region .

Used in particular as a prison, today an exhibition site on the architecture and heritage of the territory of the Agglomeration of Annecy, it offers a permanent tour of the history and heritage of this territory. You can visit the old courtrooms, the old prison cells and dungeons as well as the old chapel. The palace is classified as historical monuments by order ofFebruary 16, 1900.