Nah....
It's the British version of the Chinese Space Warfare program......only we can't quite afford the full package.
http://www.theregister.co.uk/2011/11/18/chinese_desert_mystery_sites_are_satellite_targets/
Tally ho chaps!
It's widely accepted among those with a penchant for banging on about Atlantis, the pyramids and the bloody Mayan calendar that the Nazca Lines in Peru represent a vast alien spaceport hewn from the living desert by beings so advanced that the human mind would explode if it were obliged to absorb even a millionth part of their …
But...notice that there are no propellers on those "aircraft" and you can see that what we actually have here is an insultingly careless attempt to disguise some sort of reactionless-thruster or gravitic drive capable craft as an innocuous "native" conveyance!
The insidious threat posed by those who made this travesty cannot be overstated!
We are Not Alone! The dark is full of things with pointy teeth!
Aiee!
etc!
'A teaser? Teasers are usually rich kids with nothing to do. They cruise around
looking for planets which haven't made interstellar contact yet and buzz them.'
'Buzz them?' Arthur began to feel that Ford was enjoying making life difficult
for him.
'Yeah,' said Ford, 'they buzz them. They find some isolated spot with very few
people around, then land right by some poor unsuspecting soul whom no one's ever
going to believe and them strut up and down in front of him wearing silly antennae
on their head and making beep beep noises. Rather childish really.'
Keep up.
The role of the Nazca Lines in Peru has been discovered.
The tribes at the time worshipped the large Condor bird.
So of course they had to make their images large so these big high flying birds could see them and stay around.
No aliens, spaceships or other high technology other than a broom and some string required!