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Simon starts his journey at the world-famous ruins of Machu Picchu, one of the glories of the ancient Inca civilization situated in Peru.

While Gregg Wallace visits some of the largest factories in Europe, Cherry Healey investigates the science behind products including jelly beans, jeans and bath bombs.

In the Philippines, Steve touches noses with a monitor lizard, encounters 30 tarantulas and scours the jungle in the dead of night for a pangolin.

David Attenborough explores the largest habitat of the planet, the open ocean, by searching for old secrets in the corners of the world.

Simon starts his journey at the world-famous ruins of Machu Picchu, one of the glories of the ancient Inca civilization situated in Peru.

Ben Fogle visits eastern Croatia's forests to meet Nikola Boric, an ex-Olympic coach who now lives as a hermit in the wilderness.

Gregg Wallace and Cherry Healey recieve special privilege to visit a factory that produces a large quantity of iconic yellow diggers every day.

Gregg learns about the construction of the five-carriage electric train, while Cherry Healy visits an HS2 construction site and learns about the functioning of tunnel-boring machines.

Rick Stein's gastronomic journey from Venice to Istanbul brings him to Northern Greece and the historic city of Ioannina where he tastes traditional veal stifado and kotopita.

Grasslands support vast wildlife, but in order to survive here animals must endure the most hostile seasonal changes on the planet.

Simon travels through three of the world's most extreme environments like the the salt flats of Bolivia, the Brazilian Pantanal and Paraguay's Chaco Forest.