Ancienne sous-préfecture de Sedan

Begun in 1865 under the orders of the architect Reimbeau, completed in 1868 by the architect Jean Baptiste Couty, built in the midst of the Napoleon III era, it was intended to be opposite the Macdonald district and aligned with the avenue de La Marck. 
A Louis XIII-inspired building, it combines rusticated stonework, a cartouche and a Louis XIII oculus in the roof, a central dormer window with Renaissance influences, a Louis XIV roof with a Mansard-style mansard roof, and a Palladian staircase with a central staircase. It successively served as the headquarters of the General Staff, the residence of the Prince Imperial, Emperor Napoleon III, and the sub-prefects. Napoleon III spent three nights there and left at dawn on September 2, 1870, to go to the Château de Bellevue to sign the act of surrender of his army and surrender himself as a prisoner.