Originally we planned to go to Musee d'Orsay, but the queue for Museum Pass holders was so long (Sunday, you know.) We decided to move to Arc de Triomphe and then did some shopping.
Frankly speaking, we would not go up the top of the Arch if Museum Pass did not give us free access. It turned out to be an interesting point to visit. First, you entered the Arch at the ground level, then you have to walk up a few hundreds step spiral staircase. After that, you will arrive at a level below the roof. That is a small exhibition area about the history of the Arch.