Louvre Palace areas, and parking areas, as well as an auditorium, a tourist bus depot, and a cafeteria, was constructed underneath the Louvre's central courtyards of the Cour Napoléon and the Cour du Carrousel. The ground-level entrance to this complex was situated in the centre of the Cour Napoléon and is crowned by the prominent steel-and-glass pyramid (1989), the most famous element designed by Pei. In a proposal by Kenneth Carbone, the nomenclature of the wings of the Louvre was simplified in 1987 to reflect the Grand Louvre's organization. Corresponding to the three pavilions through which the public must pass to reach
Paris in the Middle Ages not have an efficient system of covered sewers until Napoleon built them at the beginning of the 19th century. Street lighting was almost nonexistent in the Middle Ages. In 1318, it was recorded that there were just three street lanterns in Paris: one candle in a lantern outside the entrance to the Châtelet fortress; a candle outside the Tour de Nesle to indicate its entrance to boatmen; and a third lantern outside the Cemetery of the Innocents to remind passers-by to pray for the souls of the deceased. Very little light came from houses, since glass windows were extremely rare;