Tomorrow ‘will mark a difficult anniversary to truly celebrate. On June 29, the 100th running of the Tour de France – the world[‘]s most gruelling, most important and most popular bicycle race – will begin. The race, however, has also become synonymous with the plague of performance enhancing drugs… [O]n the eve of the 100th running of what was once among the single greatest athletic endeavors the world had to offer, SPIEGEL ONLINE has assembled some of the event’s most iconic images.’