Von Daniken wrote a book (it was also made into a movie or TV show) called Chariots of the Gods in which he argued that aliens settled or somehow influenced life on earth. He used various "mysteries" from around the globe to support his thesis. This iron pole being one, as well as the heads on Easter Island. Other stuff included:
1. Inca walls of irregular stone blocks weighing tons each that were fitted together with with such precision, a knife blade couldn't be slipped between them. (One wonders why the aliens came all this way to build things out of stone).
2. Aztec paintings of men in unusual costumes and headgear that he claimed were space suits.
3. Long lines etched into fields of South America that he asserted were landing strips for alien craft (even we didn't use airliner technology on our crude -- by interstellar standards -- forays to the moon).
4. Gigantic etchings, spiders, birds, etc., on the surface that could only be discerned from an aircraft. Von Daniken called them navigation markers for alien craft (they came here from another star but needed ground markings to figure out where they were?).
Did a vehicle
Come from somewhere out there
Just to land in the Andes?
Was it round
And did it have
A motor
Or was it
Something
Different
Did a vehicle
Did a vehicle
Did a vehicle
Fly along the mountains
And find a place to park itself
Or did someone
Build a place
To leave a space
For such a vehicle to land
Did a vehicle
Come from somewhere out there
Did a vehicle
Come from somewhere out there
Did the indians, first on the bill
Carve up the hill
Did a booger-bear
Come from somewhere out there
Just to land in the Andes?
Was she round
And did she have a motor
Or was she something different
Guacamole Queen
Guacamole Queen
Guacamole Queen
Guacamole Queen
At the Armadillo in Austin Texas, her aura,
Or did someone build a place
Or leave a space for Chester's Thing to land
*(Chester's Thing... on Ruth)*
Did a booger-beer
Come from somewhere out there
Did a booger-bear
Come from somewhere out there
Did the Indians, first on the bill
Carve up her hill
On Ruth
On Ruth
That's Ruth
------- Inca Roads, Frank Zappa
Unfortunately, it is completely impossible to get any idea of how this song sounds by just reading the lyrics.
I think this site has a usable realaudio version of the song--scroll down a bit to see it.