It was one the causes Princess Diana was most passionate about. A little-known organization that addresses this issue won the Nobel Peace Prize. It's not an issue we think much about, but it's one that costs countless lives every year - land mines. They are the deadly leftovers of old battles, and many innocent people are injured or killed by them. A land mine is, of course, not where you can see it coming. It's buried. You're just walking along and suddenly the ground beneath you explodes, maiming or destroying an innocent person.