Diana died on Aug. 31, 1997, after she was in a car crash which killed her boyfriend Dodi Fayed and the couple’s driver, Henri Paul. Her funeral at Westminster Abbey in London was reportedly watched by 2.5 billion people worldwide. The princess left behind two sons, Prince William and Prince Harry, who were 15 and 12 years old, respectively, at the time. Now in their 30s, they went to Kensington Palace on Wednesday to visit a memorial garden for their late mother. Here's how Diana has been remembered ahead of the 20th anniversary of her death. Prince William and Prince...