6. Green Children of Woolpit
In 12th century, two children, brother and sister, having unusual green skin suddenly appeared in the village of Woolpit in Suffolk. They spoke unknown language and ate nothing except the beans only. Soon, they learned the English language and started to eat other foods. The green color of their skin also gone away with time. The boy was sick and died, but the girl claimed they came from a place called St Martin’s Land which is located underground world. The sun never shone there and everything there is green. Nobody ever found their origins. Did they come from some alien world? It is still a unsolved mystery.