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Grand Canyon, Arizona, USA. The current Grand Canyon is just six million years old. As canyons age they get broader and deeper; the Grand Canyon is getting deeper each year by the thickness of a sheet of paper. (Franckreporter/ Getty Images)

Lonely Planet's most stunning places on Earth

Extraordinary views of magnificent waterfalls, lush parks and deserts have been brought together in 'Lonely Planet’s Beautiful World'.

The well-known travel guide is marking its 40th year with a collection

of pictures presenting the world's stunning diversity taken by the best

photographers. To celebrate its anniversary, Lonely Planet has invited

their readers to share their travel photos in order to win the chance of a 17-day trip to Tibet with photographer Richard I'Anson.