Two Easter eggs have been unearthed and the most fascinating thing about these treats is that they are 100 years old and uneaten. The extremely rare Terry's chocolate egg and Rowntree's egg will be displayed at York Castle Museum. Made in 1920, the Rowntree egg was bought by a boy for his mother, who kept it as remembrance. But Terry's chocolate egg has a very tragic story behind it. It was bought for a child who died before Easter and never thrown away.