Due to the Olympics, there was heavy traffic in central Paris, so I returned the rental car at Paris-Orly Airport, about 20km south of the city center.
Afterwards we took the metro to our hotel where we had reservations and had pizza at a nearby restaurant.
Montmartre is a large hill, 130 meter high, in Paris.
The area is primarily known for its artistic history and known as a nightclub district.
It is said that many famous artists have lived in Montmartre, including Vincent van Gogh, Claude Monet, Edgar Degas, Pablo Picasso, and Pierre-Auguste Renoir.
Armed police were walking everywhere during Paris Olympics.