Michael arrives at the border of Niger and Algeria, the most desolate crossing, and then turning north Michael passes through the mountains of the Hoggar massif before pausing in the oil and gas fields of central Algeria. Then onto Libya to attend the very last reunion of the Desert Rats of Tobruk, before turning west along the North Coast past deserted classical sites at Apollonia, Cyrene and Leptis Magna.

• Michael Palin