"Tantalising clue" to Raleigh's lost colony

In a discovery worthy of Dan Brown, experts believe they may have found Sir Walter Raleigh's "lost colony" of Roanoke inscribed on a 16th century map in invisible ink. (photos)

The map, drawn by John White, who accompanied Raleigh on his first trip to Roanoke, reveals a lozenge-shaped icon, the symbol for a fort, when illuminated with ultraviolet light. More tests are planned.