The Hall of Battles is longer than the Hall of Mirrors, 394 feet, and is lined with huge paintings of French victories through the ages, including oils by Delacroix and Fragonard. Its creation was the idea of Louis-Philippe I, King of the French and it replaced apartments which had been occupied in the 17th and 18th centuries. There are literally hundreds of busts and 39 paintings, I will not present them all.
Crypte Archéologique, stretching 118 meters under the Parvis du Notre Dame, was built by the city of Paris in order to house the archeological finds discovered during the excavation undertaken in 1965 by the Direction des Antiquites historiques de I'Ile de France and the Commission du Vieux Paris. It contains ruins of Roman quaysides, ramparts and hypocausts, medieval cellars, shops and pavements, the foundations of the Eglise Ste-Geneviève-des-Ardens, an 18th-century foundling hospital and a 19th-century sewer. Imbedded in the surface of the plaza itself are brass strips which locate the streets and buildings that were removed.