Indeed they do, the "City of Everett". You can walk around inside. Boeing used it as a test bed for various experiments. The Museum of Flight is really a gem.
Boeing used to offer tours of the 747 factory. It's immense. I wonder if they're spinning up a different manufacturing line in that building?
South of Portland is the evergreen air and space museum. They have the spruce goose in there, it's huge. The water park next door has an old 747 mounted on the roof, and I'd the start of 6 water slides.
According to Wikipedia (https://en.wikipedia.org/wiki/Boeing_Everett_Factory#Current...), they are left with just the 767 (currently only available as a cargo or military tanker plane) and 777. 787 production was moved completely to the (non-unionized and reputedly lower-quality) South Carolina plant in 2021.
If I recall correctly, that building was so vast that they had trouble controlling the weather inside on a few occasions. Trouble as in, clouds were forming and rain was falling.
May that's just myth, but I like that myth enough to not google it.
Boeing used to offer tours of the 747 factory. It's immense. I wonder if they're spinning up a different manufacturing line in that building?