After visiting the Buckingham Palace Guard Change Ceremony, we walked through St. James Park and went to the Royal Cavalry Guard parade. This is a large rectangular square paved with gravel and sand. This is the place where King's Birthday celebrations are held annually in Britain. It used to be the beach volleyball venue for the London Olympic Games. Visitors can enter and trample at will. Behind the square, several circular roofs, like churches, set off the square, making the scene look magnificent.