when were the lascaux caves closed to the public
Lascaux On September 12, 1940, the entrance to the Lascaux Cave was discovered by 18 year old Marcel Ravidat. Ravidat (died in 1995) returned to the scene with three friends, Jacques Marsal, Georges Agnel, and Simon Coencas, and entered the cave via a long shaft. The teenagers discovered that the cave walls were covered with depictions of animals.[7][8] Galleries that suggest continuity, context or simply represent a cavern were given names. Those include the Hall of the Bulls, the Passageway, the Shaft, the Nave, the Apse, and the Chamber of Felines. The cave complex was opened to the public on July 14, 1948.[9] By 1955, carbon dioxide, heat, humidity, and other contaminants produced by 1,200 visitors per day had visibly damaged the paintings. As air condition deteriorated fungi and lichen increasingly infested the walls. Consequently, the cave was closed to the public in 1963, the paintings were restored to their original state and a monitoring system on a daily basis was introduced.
Palais Garnier The Palais Garnier (pronounced [palɛ ɡaʁnje] French   (help·info)) is a 1,979-seat opera house, which was built from 1861 to 1875 for the Paris Opera. It was called the Salle des Capucines, because of its location on the Boulevard des Capucines in the 9th arrondissement of Paris, but soon became known as the Palais Garnier, in recognition of its opulence and its architect, Charles Garnier. The theatre is also often referred to as the Opéra Garnier (French   (help·info)) and historically was known as the Opéra de Paris or simply the Opéra,[7] as it was the primary home of the Paris Opera and its associated Paris Opera Ballet until 1989, when the Opéra Bastille opened at the Place de la Bastille.[8] The Paris Opera now mainly uses the Palais Garnier for ballet.