The wagon where the WWI armistice was signed is located in the forest of Compiègne at 1h30 from Paris.
It is necessary to have a car to get to the clearing of the Armistice. There is no particular difficulty for the visit, the place is well reported and there is a large car park next door. The clearing of the Armistice has a special place in the history of France as it's in this clearing that was signed the armistice of the war 14-18 and the less glorious second armistice of June 22, 1940. Hitler demanded that the armistice of 1940 was signed in the same place as that of 1918 to repair the affront made to the Germany. On the road you can also admire the castle of Pierrefonds, which is located a few kilometers away.
It is located right next to the clearing.