Royal Houses Honor 9-11

11-Sep-2011: Crown Prince Felipe and Crown Princess Letizia plant a tree as a tribute act organized by the US Embassy in memory of the terrorist attacks on 9-11-2001 in Juan Carlos I Park in Spain.

11-Sep-2011: Prince Charles, Camilla, Duchess of Cornwall, Prime Minister David Cameron, Deputy Prime Minister Nick Clegg and London Mayor Boris Johnson attend a memorial ceremony at the September 11 memorial garden in Grovesnor Square in London.

11-Sep-2011: Prince Philippe and Princess Mathilde attended a service for "memorial celebration for peace" in honor of September 11th at St. Michael and St. Gudula Cathedral in Brussels.

Pictures: Getty, Nieuwsblad