Portland Head Lighthouse, at the entrance to Portland Harbor in Maine, has a history that reads like a Who's Who from the early years of the nation. It was the first lighthouse completed by the United States government, and is the most visited, painted and photographed light in New England. One keeper took financial advantage of the area's draw, another enjoyed visits with a famous poet, while yet another thought it the most desirable place he could serve. And some believe at least one former resident has never left - RF