It would take a brave soul to set out today on a 10-year journey around the world on a motorbike, a journey that deliberately passed through places that include Congo, the Arctic Circle and the entire length of the Andes. That is exactly what the Omidvar brothers from Tehran did back in 1954. Throwing their film-making kit on their bikes and with just $90 each to spend, they set out to see the most remote people they could possibly find. En route they created a visual record that is now a milestone in film history, a documentary record of a vanished world: peoples, cultures and even entire countries that no longer exist.