Here are some cool links that you can explore on your own time to learn more about what may have happened to the Lost Colony of Roanoke:
The mystery of John White's map with a patch on it: http://www.nytimes.com/2015/08/11/science/the-roanoke-colonists-lost-and-found.html?_r=0
History Channel's America Unearthed story on the Lost Colony of Roanoke: http://www.history.com/shows/america-unearthed/videos/america-unearthed-mystery-of-roanoke
More on the Dare Stones: http://www.strangehistory.org/cms/index.php/popular/80-dare-stones-1587-1938-feature