In Pole to Pole we join Michael Palin on the second of his epic challenges. Travelling from the North Pole to the South Pole, he experiences every extreme the globe has to offer. As he crosses 16 countries by train, truck, raft, Ski-Doo, barge, balloon and bicycle, he meets a diverse range of fascinating characters and landscapes while his own endurance is tested to the limit. With his customary aplomb, he plunges himself into the local cultures, starring in a crayfish documentary in Novgorod, attending a baby-rolling ceremony at a Cypriot wedding, and consulting an Mpulugu witch-doctor.

The third and most ambitious of Michael Palin's adventures is a voyage of epic proportions - the circumnavigation of the Pacific Rim. He travels for almost a year through the 18 countries that border the world's largest ocean, and is forced to negotiate mountains, plunging gorges, cross glaciers and dodge icebergs. Volcanoes also mark Palin's journey. He climbs one which has freshly erupted and follows great rivers like the Yangtze and the Amazon to some of the most remote places on earth.

Michael Palin reads his own account of a journey into a new Europe. Michael Palin's New Europe starts with a simple idea: that only a couple of hours from home are a half of Europe that is for him as unknown and unexplored as the plateau of Tibet or the vastness of the Sahara. Cut off for most of his life by Cold Wars and Iron Curtains, Europe's eastern lands are now open for business - and Michael sets off to discover them.

In his most challenging journey to date, Palin tackles the Himalayas, the greatest mountain range on earth. It is a virtually unbroken wall of rock stretching 1,800 miles from the borders of Afghanistan to south-west China. Penetrated but never conquered, it remains the world's most majestic natural barrier, a magnificent wilderness that shapes the history and politics of Asia to this day.

Michael Palin's epic voyages have seen him circumnavigate the globe, travel from the North to the South Pole and circle the countries of the Pacific Ocean, but perhaps the greatest single challenge he has faced is his latest, a crossing of the vast and merciless Sahara Desert. As the journey unfolds, the Sahara reveals not only the emptiness of endless sand dunes, but a huge and diverse range of cultures and landscapes, and a long history of civilisation, trade, commerce and conquest.