1926: An epic battle unfolded on the stage between Bayonne and Luchon. It runs for 326 kilometers and crosses four mountain passes -- it is still known as the Circle of Death. In 1926, the riders began at 2 a.m. in a downpour (the image shows Belgian rider Albert Dejonghe. Riders had to dismount on Tourmalet because of the mud. By 10 p.m., only 30 of the 76 riders had reached the finish line and 15 were still missing the next morning. Ultimately, they all were located.