Are human beings born to travel? The latest series of Race Across the World has just reached a thrilling end. Its popularity is a measure of our obsession with travel.
Modern-day pilgrimage is ratings smash hit
Triumphant: Alfie and Owen, a football referee and a trainee pilot from Hertfordshire, were this year's winners. Glossary
Indonesian - The country consists of over 17,000 islands in the Pacific and Indian Oceans.
Species - A set of animals or plants with similar features. Members of the same species can breed with each other.
Venice - A seaport in Italy. It is built on many small islands.
China - A country in East Asia, home to 1.4 billion people.
Trade - The activity of buying and selling goods.
Middle Ages - The Middle Ages was the period in European history that came between ancient and modern times. It lasted from about 500 to about 1500.
Mecca - Islam's holiest city and the birthplace of the prophet Muhammad. Only Muslims are allowed into the city, and millions make pilgrimages there.