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Part 1 Africa: Ibn Battuta; the green sea of darkness; searching for the River Niger and Timbuktu; the source of the Nile; exploring the heart of Africa. Part 2 Asia: East goes west; Marco Polo; Vasco da Gama and the route to India; the search for the Northeast Passage. Part 3 Americas: the Vikings reach America; Christopher Columbus; Cortes; the hunt for the Northwest Passage; the building of new France; across the continent; scientists and dreamers. Part 4 Australasia: the quest for a southern continent; into the interior. Part 5 Arabia: the forbidden land. Part 6 Circumnavigation: around the world. Part 7 The poles: the race for the poles. Part 8 Mountains: the roof of the world. Part 9 Undersea: exploring the oceans. Part 10 Space: beyond the Earth; key dates in world exploration.