The Paris-Brest-Paris is a precursor to the Tour De France and is the oldest active bike ride in the world. It is a 1200km (750 mile) journey from Versailles to the coast of Brittany and back. No longer a professional race, the Paris-Brest is now held every four years, to be ridden by amateur endurance cyclists known as randonneurs.
To qualify for the Paris-Brest, each randonneur must have completed a grueling series of qualifying events ranging from 200km to 600km, all within strict time limits, and they must do so without support. Bring the tools you need to fix your own flats. Bring or find food on the route. If you do not think you can finish the course, then do not start.
These are pictures from the 2007 PBP. I attended the ride along with 5000 other riders from nations as diverse as Israel, Brazil, Japan, Canada and, of course, France. I was one of the first two Filipinos to officially finish the event. In the foreground of this photo are Danish randonneurs wearing their national PBP jersey.