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Every day they test even the most seasoned pilots. While innovative in design and technology they're also a reminder that tragedy can happen at any moment. The preils are many: short runways, high altitude, umpredictable wheather, difficult terrain, take-off and approach procedures. And in the worst cases a combination of these dangers. These are the world's most extreme airports.

An exploration of the wonders of four of the world's most iconic mountains, their nature, landscape and climate, humanity's relationship with them and our obsession with conquering these peaks.

From talking kitties and slumbering cats to dancing dogs and dogs that doze, we count down the cutest clips in the web-o-sphere to crown America's Cutest Cat and America's Cutest Dog.

World's Toughest Trucker is a show Produced by Dragonfly Productions and GroupM Entertainment and is broadcast on Channel 5 in the United Kingdom and Discovery Channel in the US. The show was Originally commissioned by Channel 5 in the United Kingdom, the format is a co-production between Dragonfly and Group M Entertainment and pits eight truck drivers against each other in a series of challenges. The winner receives US$150,000 and the title “world’s toughest trucker. It had its world premiere on 6 January 2012 on Channel 5. The show follows the success of Channel 5's other trucking programing such as Ice Road Truckers and Eddie Stobart: Trucks & Trailers. It is Broadcast on Friday at 8pm and regularly repeated. The show is filmed and broadcast in HD. Channel 5 describes the show as "The world's most fearless truck drivers face off in some of the world's most feared locations." "In an exciting new series commencing on Channel 5 this week, eight of the world’s most experienced truck drivers go head to head in some of the harshest environments on planet Earth. Drawn from England, Scotland, Canada, USA, Sri Lanka and Australia, they are challenged to navigate the most extreme routes across that include Australia, Brazil, Canada, Mongolia and India. Each journey will last three days, and they must contend with unusual cargo, massive rigs, lethal roads and each other. Along the way, the weak will be eliminated and only one will walk away with the £100,000 prize and the title of ‘World’s Toughest Trucker" Over 60,000 people applied to take part in the show. The eventual winner of series one was Englishman Stuart, with fan favorite Rookie finishing in second place and Derek in third.

Deep in the heart of the Amazon, an uncharted lake emerges every dry season when the floodwaters recede. It's rumoured that this secret lair lures reptiles little changed since the time of the dinosaurs. And not just a few; hundreds gather - even giant creatures allegedly journey to this far off, inaccessible place. Outsiders come here at their peril; fishermen claim to have lost limbs to fearsome monsters. Are these exaggerated local legends? Or is the veil of mystery about to be lifted on one of the earth's largest yet least studied carnivores - the black caiman?