After sipping all that champagne, I figured my visit to Reims needed some good old-fashioned education, and I was genuinely interested to see the room where the Germans signed their surrender at the end of WWII. Follow the signs and then head for the international flags to find the museum. Admission is free for students with a valid ID, and adults are charged about 3 to 4€ (I think--I still have my college ID, so I didn't pay).
First, I watched a short video with some good WWII-era footage and background info, and then I headed upstairs to the main museum. It was spacious, clean, and well organized, and I enjoyed looking at the photos and artifacts. The war room itself was also impressive, especially when you consider the gravity of the events that took place there. It is definitely an attraction worth visiting, whether as a history class refresher or a counter to too much champagne.