August 18 marks the anniversary of one of the greatest enduring mysteries of US colonial history: the Lost Colony of Roanoke. While the bizarre incident is often dubbed "America's oldest unsolved mystery," we now have a pretty good idea of what occurred (it just took 400 or so years to get a clear idea). In 1587, colonizers from England, ...led by John White, landed on Roanoke Island just off the eastern coast of North America, in what is now Dare County, North Carolina. It was the second attempt to set up a permanent colony, the first having failed two years...