In the autumn of 1988, Michael Palin set out from the Reform Club with an ambitious plan: to circumnavigate the world, following the route taken by Jules Verne's fictional hero Phileas Fogg 115 years earlier. The rules were simple. He had to make the journey in 80 days using only forms of transport that would have been available to Fogg.

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.

In March 2022, Michael Palin travelled the length of the River Tigris through Iraq to get a sense of what life is like in a region of the world that once formed the cradle of civilisation, but that in recent times has witnessed turmoil and appalling bloodshed. It was a journey of sharp, often brutal contrasts. At one moment he would be exploring the old streets of Baghdad or the ancient ruins of Babylon. At the next he would be visiting the war-torn city of Mosul, or learning about the horrific Speicher massacre in Tikrit.

Michael Palin journeys to a vast country of unimaginable contrasts - Brazil. An economic powerhouse, it is host to a staggering variety of peoples. He starts his journey in the north, in the remote mountains and forests on the border with Venezuela, and finishes in the south at the legendary Iguaçu Falls. He travels by river-boat, float-plane and foot to visit tribes deep in the jungle, samples life in the agricultural and mining heartland of Brazil, experiences the modernism of Brasília and the heady mix of Rio de Janeiro, and ventures into the favelas.

When Monisha Rajesh announced plans to circumnavigate the globe in 80 train journeys, she was met with wide-eyed disbelief. But it wasn’t long before she was carefully plotting a route that would cover 45,000 miles - almost twice the circumference of the earth - coasting along the world’s most remarkable railways; from the cloud-skimming heights of Tibet’s Qinghai railway to silk-sheeted splendour on the Venice Simplon-Orient-Express. Packing up her rucksack - and her fiancé, Jem, Monisha embarks on an unforgettable adventure.