Britain's Prince William looks over the edge of a cliff and observes abseiling by the Mountain Youth Services group near his wife Catherine (L), the Duchess of Cambridge, as they visit Narrow Neck Lookout in the Blue Mountains town of Katoomba, west of Sydney on April 17. Britain's Prince William and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son George. Reuters/Ryan Pierse/Poo