I think I already mentioned how on the first Sunday of each month all of the state-owned museums in Paris are free of charge.
So one of those Sundays I decided to check out the Army Museum. Not something I would pay for, so I figured I would at least make the effort to check it out when it was free.
The main thing I wanted to do was see Naploeon's tomb... but (classic) that was the one part of the museum that isn't free.
So I decided to just quickly check out the chapel in the complex and call it good. (I then proceeded to get lost in the neighborhood because by this point I wasn't in the habit of taking my map with me anymore. Woops.)