There is a much-photographed sign in Zagora, in the spectacular Draa Valley in Morocco. Beside the image of a blue-swaddled desert nomad is written: “TOMBOUCTOU 52 JOURS.” The journey is considerably quicker today, but if you go by camel, it probably still takes 52 days. Zagora is a popular starting point for trips on camel back into the Sahara Desert and this famous sign gives some indication of the significance of this area back in the mists of history.