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Gregg Wallace discovers how one of the world's largest chocolate factories produces a staggering seven million bars a day.

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.

Steve reveals that all dogs are descended from wolves. He further explains that wolves are incredible hunters and many of their deadly attributes are prominent in the canine world.

Stanley takes through the history and ingredients of Naples famous pizza through finding the freshest mozzarella and the best San Marzano tomatoes. Then, he explores the island of Ischia.

Explore what makes the British passport one of the most secure documents on the planet.

Simon visits one of the remotest regions of the Amazon, with the Waiapi people, who cling on to their traditional way of life, which is under threat from logging and mining interests.

The hosts visit some of the biggest food production units in Britain and share details about the various processes that take place inside these factories.

The hosts visit some of the biggest food production units in Britain and share details about the various processes that take place inside these factories.

After facing some of the planet's colder climates, Robson Green heads to warmer shores on a trip to New Zealand where he learns to cook trout in Lake Rotorua's thermal sands.

The host, Sir David Attenborough, explores Asia, uncovering the continent's stunning wildlife and natural wonders and offering awe-inspiring discoveries about Earth's largest landmass.

The filmmaker explores the river's path from the Himalayan foothills to the Terai, where towering grasslands grow thick enough to hide elephants.

Stanley Tucci goes to Rome in search of the famous four pastas. He orders rigatoni all'amatriciana, samples carbonara and tries a variety of cheeses and sausages made from local sheep and pigs.