Ben Fogle enters 'the toughest foot race on Earth' - a 150-mile run through the Sahara. How will he cope with the desert's debilitating heat?
Take a look at some spectacular images from Gordon Buchanan's Polar Bear Family & Me.
Watch the trailer for Outback Rangers.
Deserts are the most haunting of all the Earth's landscapes.
Photos from Tribal Wives; the ultimate wife swap!
Adventurer Ben Fogle has had a remarkable life so far.
Watch highlights from our live Ask Attenborough event with Sir David.
Simon Reeve talks about what essential items he always packs in his suitcase.
Simon Reeve wants to share his passion for our planet with younger generations.