BBC Earth

X-man' James Marsden joins Bear on an adventure into the heart of Rattle Snake Canyon in Utah, where they helicopter on to one of the highest arches in the area.

Simon Reeve battles his way across the Congo, braving thick jungle and tropical swamps in search of the people and the wildlife who make their home in Africa's greatest rainforest.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

Journey across Madagascar, the oldest island on earth. Over time, it has given rise to more unique plants and animals, from its lemurs to chameleons, than any other island.

In the second leg of his journey, Simon travels down the Rocky Mountains. In Montana, he meets a former Silicon Valley executive who has envisaged a new future for the land.

Grasslands cover a quarter of all land and support vast gatherings of wildlife - but to survive here animals must endure the most hostile seasonal changes on Earth.

Simon Reeve battles his way across the Congo, braving thick jungle and tropical swamps in search of the people and the wildlife who make their home in Africa's greatest rainforest.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

Journey across Madagascar, the oldest island on earth. Over time, it has given rise to more unique plants and animals, from its lemurs to chameleons, than any other island.

X-man' James Marsden joins Bear on an adventure into the heart of Rattle Snake Canyon in Utah, where they helicopter on to one of the highest arches in the area.

Simon Reeve battles his way across the Congo, braving thick jungle and tropical swamps in search of the people and the wildlife who make their home in Africa's greatest rainforest.

In the second leg of his journey, Simon travels down the Rocky Mountains. In Montana, he meets a former Silicon Valley executive who has envisaged a new future for the land.

Actor Michael B. Jordan joins Grylls in Wales where they start their journey by dropping into rough waters off the coast before making their way to the mountains.

Wild and unpredictable, the Scandinavian coast is a place of haunting beauty and dangerous extremes, home to feisty puffins, orcas, eagles, otters and intrepid base jumpers.

Robson Green recalls his most memorable Extreme Fishing moments. He has found himself in some tricky situations and come face to face with some amazing fish and fisherman and women.

Ben Fogle returns to Bulgaria to meet up with nomads Miriam and Peter after four years.

Actor Michael B. Jordan joins Grylls in Wales where they start their journey by dropping into rough waters off the coast before making their way to the mountains.

Wild and unpredictable, the Scandinavian coast is a place of haunting beauty and dangerous extremes, home to feisty puffins, orcas, eagles, otters and intrepid base jumpers.

Ben Fogle returns to Bulgaria to meet up with nomads Miriam and Peter after four years.

Actor Michael B. Jordan joins Grylls in Wales where they start their journey by dropping into rough waters off the coast before making their way to the mountains.

Robson Green recalls his most memorable Extreme Fishing moments. He has found himself in some tricky situations and come face to face with some amazing fish and fisherman and women.

Wild and unpredictable, the Scandinavian coast is a place of haunting beauty and dangerous extremes, home to feisty puffins, orcas, eagles, otters and intrepid base jumpers.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

Robson Green recalls his most memorable Extreme Fishing moments. He has found himself in some tricky situations and come face to face with some amazing fish and fisherman and women.

Ben Fogle returns to Bulgaria to meet up with nomads Miriam and Peter after four years.