It will be good to use your GPS anytime you want to go. I also think you should visit their Website to get more information b4 going there.
It's kind of 20 minutes away, take an Uber or drive. They offer parking.
There is a bus route but it is not very easily accessible by public transportation. There is a Capitol Bike share station at the entrance though.
go to the metro website at wmata.com find- Plan my trip it will show you how to get there via all methods of public transportation and the cost
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