Following in the footsteps of his mum, Princess Diana, Harry has visited hospital patients, Aids victims, homeless people, orphans, young offenders and worked on schemes to improve people's health in poorer countries.

On his 18th birthday, he asked for the money made from the sale of his birthday photos to go to charity.

The charity called Merlin is not well-known, but they help save millions of people affected by wars and disease in countries like Africa and Afghanistan.