Best place to park is parking garage...$20 for the whole day. If you choose free after parking, you most likely will drive around for a while as most are taken.
If I were to drive to DC, id park at hotel or a metro station. I always use the awesome public transportation.
Drive around until you find a street parking, otherwise all day parking garage is available.
This is some street parking
You can park on the side of the road or at parking locations located within a block of the monument they all charge a few bucks tho
There is metered parking along the streets next to the memorial. I am unaware of any free parking.
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