Fifteen minutes later, the helicopters ducked into an alpine valley and slipped, undetected, into Pakistani airspace.

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Glenn Alps connects to Powerline Pass with a trail through a spectacular alpine valley, beloved by hikers and mountain bikers.

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Flip through the Seattle architect's portfolio and you'll see roofs that levitate on muscular pistons, angular cabins that roll across an alpine valley on wheeled stilts and Brobdingnagian hand cranks that swivel six-ton window walls.

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The declared aim of Davos is rather to share ideas, to inspire change, to give the leaders the ammunition they will need once they leave this secluded alpine valley and return to the real world, ready to change things, bit by bit, until hopefully, one day, the world has become a better place.

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Just before midnight on May 26th, a herd of nearly 200 cows started out along an old track to Alpine pastures at 1, 300 metres within the Oasi in the Upper Sessera Valley.

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The settlers worked hard, clearing the forests along the valley floors, and making their living from livestock in a region where few crops grow well, but Alpine meadows are pasture for goats and cattle which produce unrivalled milk and cheese.

BBC: Hiking the Alpine Walserweg trail