Long story short, the Arc de Triomphe honors those who fought and died for France during wartime.
For those of you that opt to purchase the Paris museum pass, it would cover the entrance fee for the Arc. My Husband and I opted out of the museum pass because we didn't want to feel pressured to make the most of it or risk putting it to waste. Some people find great value in getting the museum pass, but we decided to opt out of it and just pay the face value if and when we decide to visit a museum. Other than value, another advantage of the pass is that you get to skip the lines and go straight in. Fortunately for us that day, we only waited 15 minutes to purchase the tickets.
After purchasing the tickets, we climbed 284 steps to the top of Arc, where we enjoyed a 360 view of numerous avenues of Paris. It was a semi-foggy night, but we were able to see the Eiffel Tower in all its glory. Comparing the Arc during the day and at night, I personally prefer the night view.