First run in 1891, PBP is a gruelling test of human endurance and cycling ability. Organised every four years by the host Audax Club Parisien, the Paris-Brest-Paris Randonneurs is the oldest bicycling event still run on a regular basis on the open road. Beginning on the southern side of the French capital, it travels west 600 kilometres to the port city of Brest on the Atlantic Ocean and returns along the same route. Todays randonneur cyclists, while no longer riding the primitive machines used a hundred years ago over dirt roads or cobblestones, still have to face up to rough weather, endless hills, and pedalling around the clock. A 90-hour time limit ensures that only the hardiest earn the prestigious PBP finishers medal and have their name entered into the events Great Book along with every other finisher going back to the very first PBP.