You may have to pay for parking if you drive, but the museum is free to enter.
Yes, free admission.
Entry is free
Yes free, also there is a free guided tour ar 11am I guess, Don't miss that
Yes it's free to get in. If you like history you'll love it. As far as parking goes, what ever hotel you're in, you can walk a block or two and take a metro bus for $1.00. Union station is right next to the Postal Museum in case you take a metro train.
It's free
completely free
Free
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