The Tour de France may provide the most obvious fame and glory, but it is cycling's one-day tests that the professional riders really prize. Toughest, longest and dirtiest of all are the so-called "Monuments", the five legendary races that are the sport's equivalent of golf's majors or the grand slams in tennis. Milan-Sanremo, the Tour of Flanders, Paris--Roubaix, Li ge-Bastogne-Li ge and the Tour of Lombardy date back more than a century, and...