Ok, the Arc de Triomphe and the Eiffel Tower are not next to each other in RL, but the Sims are worth seeing. The Eiffel tower you can climb and fly down from above. That should not be tried in RL ^^ I also like Notre Dame and many great Art Nouveau buildings. I found also a Moulin Rouge, but I did not understand whether, how and when there are events. But you can rezz an oldtimer by clicking on the sign and drive around. After all, there are 4 sims to explore.
And when you are in Paris, don't miss the the new exhibition of Betty Tureaud: North Pole