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Two gritty teams of hobbyist cavers attempt to break records for the longest and deepest caves in Canada.

Joanna heads to the remote Indonesian island of Banda, once the only place on Earth where nutmeg grew, discovering both its charms and its tragic past.

Dan travels the historic road of Ermin Way, which links the two Roman towns of Calleva Atrebatum and Glevum - now known as Silchester and Gloucester.

Liz Bonnin joins a team of biologists atop a volcano studying the endangered Galapagos pink iguana, then descends a kilometre into the ocean abyss in search of a new species hiding in the dark.

Dan travels along Fosse Way, arguably Britain's most hedonistic Roman road, which stretches through the heart of England from Exeter to Lincoln.

Dan explores Dere Street, which is the most northern Roman road in Britain, as well as Stanegate, which runs alongside the defensive barrier of Hadrian's Wall.

Starting in the Far East on the frozen Japanese sea of Okhotsk, Joanna takes us across China and Mongolia, ending at Lake Baikal in Siberia, where she meets some amazing seals.

Wildlife filmmaker Gordon Buchanan journeys into Lapland to film the Northern Lights. He travels through the beautiful remote wilderness, accompanied by a Scandinavian reindeer.