A view shows the Cavern of Pont-d'Arc project site during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m² of the original site into 3000m², will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. (Photo by Robert Pratta/Reuters)

A visitor takes pictures of a replica of pre-historic animals drawings seen on a wall during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic engravings showing a horse and an owl are seen on wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

French prehistorian Jean Clottes speaks to journalists during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic drawings showing horses, rhinoceros and aurochs is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A visitor looks at a replica of pre-historic animals drawings on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic animals drawings is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A visitor looks at a replica of pre-historic animals drawings seen on a wall during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of a pre-historic animal drawing is seen on wall at the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

Visitors look at pre-historic engravings during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic drawings showing lions is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic drawings showing animals is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic drawings showing animals is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

Visitors look at a replica of pre-historic drawings on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic drawings showing lions is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)

A replica of pre-historic animals drawings is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. (Photo by Robert Pratta/Reuters)