After reaching Shangri-La in China, the teams discover where they’re headed next – one of the world’s oldest living cities, Varanasi.

The five pairs are challenged to race from the island checkpoint of Sanya to the mysterious Shangri-La – a city sitting on the edge of the Tibetan plateau towards the foothills of the Himalayas.

With a thrilling third series of the Bafta-winning adventure now over, our five pairs meet up again to reflect on the adventure of a lifetime. Season Finale

The teams race to reach the second checkpoint – Sanya, one of China's most southerly cities. As well as choosing the best route to get there, they have a typhoon to contend with.

The five teams reunite for the first time to reveal fascinating insights into their different strategies and individual experiences - from their highest highs to their lowest lows.

The race to St John’s continues as the five teams leave Haida Gwaii and head into the heart of the Yukon towards the second checkpoint, the former gold rush boom town Dawson City.

The five pairs leave Dawson City and head south to the third checkpoint, the Rocky Mountain resort town of Banff. This time, the team arriving in last place will be eliminated from the race.

The teams head for Lake Huron, a 3,000-kilometre journey, but the pairs only have one way out of Churchill – a noisy overnight train south.

In the first episode, the teams set off from Mexico City – a gargantuan metropolis and the largest Spanish speaking city in the world.

Five teams set off from Vancouver on a race across Canada. Without smartphones, internet access or credit cards, they will need plenty of ingenuity to make it to the finish line in Newfoundland.

The teams head for the fourth checkpoint, the remote outpost of Churchill, on Hudson Bay. The only transport is a twice-weekly train, and they have just three days to catch it.

The five intrepid teams reunite in London to look back at their 51-day thrilling adventure through some of the most beautiful, populous and remote places on the planet.

The four remaining teams leave Azerbaijan and head across the deserts, mountains and Silk Road cities of Central Asia in the third leg of the challenge. Along the way, they meet a stuntman with a high-octane car, get the chance to watch a grisly 13th-century Kazakh sport played between horse riders and using the carcass of a dead goat, and brave a storm on the Caspian sea.

The global travel series reaches another level this week as the four remaining teams enter the People’s Republic of China. After nearly a month on the road together, relationships are coming under increasing pressure in what is the most challenging leg of the race to date. With vast distances to cover to the checkpoint - the ancient village of Huangyao - budgets are running low and emotions are high.

The race to Ushuaia is underway, and the five teams head out of Copan Ruinas in western Honduras to their next checkpoint – Panama City

The race to Lombok is well underway and less than five hours separate the teams. Leaving Nara City, they must cross their first border into South Korea to reach the second checkpoint in Sokcho.

Five intrepid duos are tasked with undertaking the trip of a lifetime, racing over 14,000km across the world’s largest continent, Asia, taking in three of its nations – China, Nepal and India.

The five teams head to their next checkpoint - Baku in Azerbaijan - a journey that will see them leave behind the familiarity of the West for the exotic and unknown of the East.

It is the penultimate leg of BBC Two’s unrivalled travel series, that has taken viewers on a journey through the wilds of Kazakhstan to ancient villages in China. This leg sees the remaining four teams head through the dense forests and bustling metropolises of Cambodia and Vietnam, and the final checkpoint before Singapore – the island paradise of Koh Rong.

In the sixth leg of the race, the pairs must brush up on their language skills, as the next stop is in Quebec. To get there, the teams must navigate Canada’s most densely inhabited region.

The teams enter south east Asia, starting the third leg from Vietnamese capital Hanoi. They must race over 2,000km through Vietnam and into the Kingdom of Cambodia to reach Phnom Penh.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

The teams face the final leg of their journey, travelling 1500 miles down the Malaysian Peninsula to Singapore. However, seven weeks on the road is starting to take its toll. Josh and Felix are reliant on the kindness of strangers, Natalie and Shameema make a desperate gamble, Tony collapses with back pain, and Darron is forced to face his fear of dogs. Last in the series.

Setting off from Panama City, they take to the Caribbean Sea, bypassing the most dangerous place in the Western Hemisphere - the Darien Gap.

41 days since the start on Canada's Pacific coast, the teams now have the Atlantic within their reach, lapping the shores of the seventh checkpoint at the seaside town of Liverpool, Nova Scotia.