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

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.

Ray journeys to the magnificent Isle of Skye in search of Britain's rarest bird of prey, the spectacular sea eagle.

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.

In search of the roots of Chinese culture, Michael Wood joins the Qin family reunion, where 300 relatives gather to worship their ancestors on Tomb Sweeping Day.

Ray uses the Derwent River as his guide to the breathtaking Borrowdale valley, a place of ancient rainforests and home to some very special wildlife - including peregrine falcons.

Bettany joins pilgrims at a thousand-year-old temple, takes India's steepest railway line in the Nilgiri Mountains and witnesses an elaborate Theyyam dance in Kerala.

Ray visits Galloway, exploring the riches of the stunning coast of southwest Scotland and the hidden treasures that live in Britain's largest forest park - including the rare and elusive pine marten.

From the holy city of Varanasi to Akbar the Great's capital of Fatehpur Sikri and the Golden Temple in Amritsar, Bettany immerses herself in the spiritual worlds of India.

Ray explores the wildlife surviving against all odds in the rugged landscapes around Britain's highest mountain range, Snowdonia.

Once ruled by fearsome Thracian kings and at a crossroads between east and west for millennia, Bulgaria is a treasure trove of history and culture.

Patrick heads deep into the jungles of Costa Rica, following squirrel monkeys on the move as he tries to find out why the insect population is in such steep decline.