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Home to some of the world’s most bizarre UFO and alien sightings, the vast state of Alaska measures more than 1.5 million square kilometres, yet only 160,000 of its 365 million acres of land are inhabited by humans.

Think you know Australia? Think again. Here we present 20 amazing facts about the country, taking in the Great Barrier Reef, an epic 'dingo fence' and a UFO hotspot as we go...