On board a timeless dahabiya cruise boat, the historian sets off on a 900-mile adventure up the Nile to Egypt's southern border, seeing the country as the ancient Egyptians once did. She arrives at Egypt's gateway to the world - the Nile's mouth - then meets the crew that will guide her upstream. A visit to the Cairo Museum and its collection of Egyptian mummies follows, before Bettany braves the underground tunnels of a collapsed pyramid.
James begins his epic journey across Japan on the icy northern island of Hokkaido, throwing himself head first into the physical demands of dog sledding, snowball fighting and the baffling struggle of ordering noodles from a Japanese vending machine. Despite all that, there’s still time for octopus fishing and learning the art of samurai sword making.
In Dagestan - which the Foreign Office warns against visiting - Levison experiences warrior clans' hospitality, stunning beauty and ancient cities. Then it's on to country-of-contrasts Azerbaijan.
Simon travels across Central America, from the Caribbean to the Pacific. Along the way, he goes diving on a coral reef on the coast of Belize, and witnesses a gun battle between park rangers and intruders in Chiquibul National Park. He also discovers how climate change has left Guatemala devastated by famine and drought, reports on measures to curb gang violence in El Salvador, and learns how Costa Rica aims to become the world's first carbon neutral country by 2021.
Setting out amongst the active, snow-capped volcanoes of Kamchatka, over 4,000 miles from Moscow, Simon explores one of the remotest regions of the country. The population of Russia's far east has fallen dramatically in recent years, but travelling by chopper and skidoo, Simon finds indigenous reindeer herders who are still eking out a fragile existence. In the port city of Vladivostok, Simon visits a newly built mega casino, designed to attract high rollers and tourists from neighbouring China. Deep in the forest, Simon meets the inspirational conservationist who has created a sanctuary for the country's most iconic predator, the giant Amur tiger. Simon ends his journey on the rim of a giant crater that has emerged in the Siberian landscape - chilling evidence of the impact of global climate change.