Celebrated each March in the mountain town of Nederland, Colorado (15 miles west of Boulder), this weekend-long party all started with a cryogenically frozen body and a bizarre set of circumstances to match.

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It was a long march into the deepest part of the mountain.

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While the mountain can be climbed any time of year, the best season to go is between March and May, when the volatile weather is less severe.

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Given over to mountain bikes, horses and hikers in the summer, the trails are groomed for skiing between December and March, weather permitting.

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Global landmarks that are going green on 17 March include Niagara Falls, the Leaning Tower of Pisa, Burj al Arab in Dubai, Table Mountain in South Africa, New York's Empire State Building and Berlin's TV Tower.

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