On a barren desert in south America lies one of the greatest archaeological puzzles in the world.
Etched in the surface of the desert pampa sand are hundreds lines,
geometric shapes and pictures of animals and birds,
and their patterns are only clearly visible from the air.
They were built by a people called the Nazcas,
but why and how they created these wonders of the world has defied explanation.
The lines were first spotted when commercial airlines began flying across the Peruvian desert in
the 1920's.
Passengers reported seeing "primitive landing strips" on the ground below.
No one knew who had built them or indeed why.
Austrian writer Erich Von Danikken claimed that were evidence that the earth
had been visited by extra-terrestrials aliens.
The lines, he said, were runways for their spacecraft...