It's a mystery that has intrigued Americans for centuries: What happened to the lost colonists of North Carolina's Roanoke Island? The settlers, who arrived in 1587, disappeared in 1590, leaving behind only two clues: the words "Croatoan" carved into a fort's gatepost and "Cro" etched into a tree.

Theories about the disappearance have ranged from an annihilating disease to a violent rampage by local Native American tribes. Previous digs have turned up some information and artifacts from the original colonists but very little about what happened to them.

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