Tickets are not required except for occasional special events. The main portion of the museum is always open to the public, within the operating hours, of course.
The majority of museums in Washington, DC, ARE FREE; except for those operated as non government not for profits, or privately held museums foundations
No it's free, no waiting for tickets either
Great place to stop and warm up, or cool down.
No need you just enter to the museum
No, just show up when they're open for free admission.
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