Paris. It doesn't always end in Paris, but it mostly does!
"Tour de" basically means "tour of". So tour de France = tour of France.
Le tour de France
Tour de France Tour de France
"Tour de France on TV" is "(le) Tour de France à la télévision" in French.
The course of the Tour de France change every year so, time to time, it might start in neigbouring countries. However most of it is raced in France and it has always finished in Paris.
Bicycles are raced in the Tour de France
The final stages of the tour de France traditionnally end on the Champs-Elysées avenue, in Paris France. The finish line isn't up the avenue near the Arc De Triomphe, but rather near the bottom of the avenue, just up the Rond-Point.
Tour de France Féminin was created in 1984.
bradley wiggins won the tour de france
André Leducq, France, won the 1932 Tour de France
Rene Pottier won the 1906 Tour de France.