Up nextComedian Sue Perkins and adventurer Charley Boorman travel across Alaska to the notorious Dalton Highway, where avalanche units operate throughout the year.
World's Most Dangerous Roads
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Comedians Rhod Gilbert and Greg Davies attempt to drive through the mountainous, landlocked nation of Nepal.
Ben Fogle and Hugh Dennis travel from the Peruvian Andes to the depths of the Amazon, in search of the lost city of Constitucion.
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