Libya has exotic brilliance, ancient cities and forbidding deserts.
David follows the trail blazed by Butch Cassidy and the Sundance Kid.
The Cardamom Mountains.
The Cardamom Mountains are the only place on the planet where the unicorn might survive.
The secrets of the Nile.
The least-known section of the Nile en route to Kartoum.
The trail to a utopian kingdom in inner Asia.
The legend of Jason and the Golden Fleece.
Secrets of the Nile.
The Lost City of the Incas in Peru.
Crossing far eastern Siberia by dog sled.
Sailing the Kenya coast for the lost world of the Arab seafarer.
Searching for the Lost Ark in the Ethiopian Cush.
Iran's ancient cities remain untouched for eight centuries.
The world's biggest desert, the Sahara.