I had been to Arc de Triomphe de l’Étoile at the western end of Champs-Élysées, but not yet up to the top. It is a short walk to St Paul and then Metro 1 to Place Charles de Gaulle (formerly Place de l’Étoile).
When you get to street (Champs-Élysées) level from the Metro, almost immediately is the start of an underground passage to the Arc de Triomphe. This takes you under l’Étoile, the twelve avenues radiating from the Arc de Triomphe. It would be impossible to cross at street level.
Near the end of the underground passage is a billetterie (ticket booth) for going to the arch’s top. Fortunately I had purchased my ticket online. The line was already well into the underground passage and it was just the opening hour (10h00).
Back at surface level, there is a huge flag flying from the middle of the arch. It was a day with a little wind and the flag was stretched out very nicely.
There was a short security line for those of us with tickets and then into the circular stairs to the top. There is no elevator option. I did not count the stairs, but there are a lot of them. The circular stairs lead to an internal-to-the-arch room with some exhibits. Then a standard set of stairs to the next, still internal, level with more exhibits and a souvenir store. Then yet one more set of stairs to the terrace level up top.
Note: Today was a good (bad?) day for stairs. When I was leaving the apartment and was most of the way down the stairs, I noticed I had my reading glasses, not my long distance ones. OK. Back up to the apartment. Switch glasses. And start again.
From the tour eiffel I took a picture of the Arc de Triomphe. Here is the reverse: the tour eiffel (and on the left the box it came in) from the Arc de Triomphe.
This westward to La Défense. I cannot see the huge arch there, but you can see the long, straight avenue leading directly to it.
Moving more northward you can see Sacré-Cœur on its hilltop. In the foreground are the spikes of the guard fence keeping us from jumping from the top of the Arc de Triomphe.
Finally, eastward is the Champs-Élysées. Again, I cannot see the intermediate-sized arch or Place de Concorde, but the long, straight avenue is plain to see.
The pictures from tour eiffel and Arc de Triomphe give you a feeling of the size of Paris. As an historical comparison, the Arc de Triomphe location was right on the city wall marking the city of Paris limits when it was built.