What exactly is the Tour de France? Is it a marathon?
It is a bicycle race completed in multiple stages - it is held in France, though the bikers sometimes pass through countries that are nearby
What other countries does the Tour de France pass through? 
I'm not too sure, but I do find it interesting that it has been held every year since 1903, except for when the two World Wars were going on.
Tour de France
The race came to be as a method to increase sales for  the newspaper "L'Auto"
Wow, that's interesting. Do you happen to know what is the fastest completion of the Tour de France. My guess is Lance Armstrong?
I don't know if Lance was the fastest ever, but he did win a record seven consecutive times from 1999 to 2005.
Yeah, I remember when I was a child everyone was talking about him beating cancer and taking on the Tour de France. Do you happen to know how long is the actual tour by distance?
the Amaury Sport Organisation. The race has been held annually since its first edition in 1903 except when it was stopped for the two World Wars. As the Tour gained prominence and popularity, the race was lengthened and its reach began to extend around the globe. Participation expanded from a primarily French field, as riders from all over the world began to participate in the race each year. The Tour is a UCI World Tour event, which means that the teams that compete in the race are mostly UCI WorldTeams, with the
Tour de France
The Tour de France () is an annual men's multiple stage bicycle race primarily held in France, while also occasionally passing through nearby countries. Like the other Grand Tours (the Giro d'Italia and the Vuelta a España), it consists of 21 day-long stages over the course of 23 days. It "is the world’s most prestigious and most difficult bicycle race".
The race was first organized in 1903 to increase sales for the newspaper "L'Auto" and is currently run by