Yes, the parking lot is free, but you must be out of it shortly after closing time as they lock the front gates... Have fun...
Yes, you don't pay for access to Ft. McHenry, only the inner fort buildings. Walking around the grounds and outer fort by the cannons is free. There are plenty of rangers on staff to explain what you're paying for if you need further clarification
Yep, and it is well worth the visit
Yes, but you do pay for access to the monument
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