Sahara with Michael Palin S01 E03 Absolute Desert

Michael reaches Timbuktu along with a camel train carrying the giant salt blocks that made the city one of the greatest centres of Islamic learning up until the 16th century. He wanders through the rubble that is 21st century Timbuktu to find the Imam who shows him original astronomical textbooks that predate Galileo's discoveries by 200 years.