Discovered in 1926 in Peru, the Nazca lines are great figures drawn on the floor (geoglyphs), often figurative, sometimes several kilometers long, which are in the desert. The ground on which they draw is covered with pebbles that iron oxide has colored in gray. By removing the Nazca revealed a clearer ground gypsum, cutting the edges of their images. The Nazca lines and Pampas de Jumana are inscribed on the World Heritage List of UNESCO since 1994. Roger.