I believe the Museum of Flight in Seattle has had the original production 747 for some time.
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?
Not sure if it’s retained that title, but the inside is just insanely vast.
Amazing to me that a building over half a century old is still the largest in the world.
May that's just myth, but I like that myth enough to not google it.