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If you're going to pick just one walk to do in the North Island of New Zealand, make sure it's the Tongariro Northern Circuit. Mountains, rainforests and river valleys are reasonably common environments all over the world, but active volcanoes are much less common and Tongariro National Park boasts a seriously impressive collection.

A London Underground sign

My latest project – walking the Tube – is for charity; you can find out more here.