In 1997, John Lambert from Ipswich, England, decided to build a fence around his house. While digging, he hit a large bone with his shovel, but he didn’t pay attention and took it to his barn, forgetting about it for 16 years. In 2013, he finally brought his find to specialists, and it turned out to be a bone of a pliosaurus — a giant sea serpent that inhabited the Earth 60-250 million years ago.