If you're touring Flagler College in historic St. Augustine, look for an old man in a straw hat who wanders away from your group. He is Henry Flagler, railroad magnate, co-owner of Standard Oil, and perhaps the man most responsible for the Florida boom. He built the spectacular, 540-room, Moorish Revival palace that now houses his namesake college. And he died back in 1913. The glow around the door of the unoccupied room on the third floor is the...