The Palais des Rais (Arabic: قصر الرياس), also known as Bastion 23, is a classified historical monument[1][2] located in Algiers, Algeria.

[1] Consisting of three palaces and six houses, whose history began with the construction of Bordj-Ez-zoubia in 1576 by the Dey Ramdhan Pasha in order to reinforce the means of defence of this side of the Medina, this quarter ended up being detached, and even isolated from its traditional environment following the restructuring of the lower Casbah during the French period.

Over time, the site earned several names, including Qaa El-Sour, Sabaa El-Tabran, and Toubanet Arnaout, reflecting its defensive purpose and the artillery brought by Rais Yahia.

However, the building suffered from exposure to climatic factors and its proximity to the sea, resulting in harmful effects that eventually posed a risk of collapse.

These measures aimed to transform the site into what would later become the Center for Arts and Culture at the Palais des Rais (Fort 23).