I guess the more direct question is about the areas that are considered to be Federal Parks (NPS), which includes the stuff on Independence Mall. What I am looking for is anyone with experience of being searched at the entrance of one of these places while carrying, and how that went.
The NPS website does not directly state ALL park buildings, as it states "certain park facilities and buildings."
Firearms in National Parks
The law governing possession of firearms inside a national park changed on February 22, 2010.
Visitors may possess firearms within a national park unit provided they comply with federal, state, and local laws.
The role of the responsible gun owner is to know and obey the federal, state, and local laws appropriate to the park they are visiting.
Please remember that federal law prohibits firearms in certain park facilities and buildings. These places are marked with signs at public entrances.
For more information
Please visit
www.nps.gov/nero/firearms/