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!
Watch highlights from our live Ask Attenborough event with Sir David.
Celebrating the best of Africa, the second largest continent on Earth.
Central Asia includes Afghanistan, Kazakhstan and Tajikistan.
Revel in the very best Australia has to offer with this gallery.