Helen Helliwell, CEO of the Invictus Games in Birmingham, hopes that Prince Harry and other members of the royal family attend the event when it returns to the U.K. in 2027.

Prince Harry offered to share his schedule with the royal family amid tensions with King Charles, who has cancer. Experts call the move "desperate."

Almost as importantly, the estate is Princess Diana's final resting place. She was buried in the grounds of the residence at her brother’s request. Her grave is located on a small island nicknamed "The Oval," in the center of an artificial lake on the estate. Her burial place is not accessible to guests or any member of the public.