PROVINCETOWN, MA (AP).- Quick, name the landmark in Massachusetts that marks the spot where the Pilgrims first landed in the New World. Plymouth Rock? Try again. Soaring more than 250 feet above picturesque Provincetown Harbor at the very tip of Cape Cod is the nation’s tallest all-granite structure, a 100-year-old monument at the place where the Mayflower initially dropped anchor after its perilous journey from England. Impressive as the tower may be, its story surprises many visitors who since childhood have learned only the iconic tale of Pilgrims, Plymouth Rock and the first Thanksgiving, and little if anything about what happened first. “They’re shocked,” said Laurel Guadazno, education and program manager for the Pilgrim Monument and Provincetown Museum. Often tourists ask: “Really? How come we weren’t told