Interesting. How so? I imagine it as office after office after office ...
The FBI has a museum in it. You can see John Dillinger’s “death mask”.
The old FBI building had a museum on the bottom floor. When we visited, a docent took us on a guided tour of it. He said that one of the men on the Ten Most Wanted list boasted that he would visit the building one day and take the tour (I never learned whether or not he did).
“I imagine it as office after office after office ...”
...They have/had a specific area for tourists to see the FBI from its beginnings. A museum with Machine Gun Kelly, Al Capone, Baby Face Nelson relics. Very cool stuff.