Passage: The Boy in the Box was originally buried in a potter's field. In 1998, his body was exhumed for the purpose of extracting DNA, which was obtained from enamel on a tooth. He was reburied at Ivy Hill Cemetery in Cedarbrook, Philadelphia, which donated a large plot. The coffin, headstone, and funeral service were donated by the son of the man who had buried the boy in 1957. There was significant public attendance and media coverage at the reburial. The grave has a large headstone bearing the words "America's Unknown Child." City residents keep the grave decorated with flowers and stuffed animals.

Question: What is on the gravestone?
America's Unknown Child.