Oh, and I was fortunate enough to actually live near a bunch of the places in the book, which helped me visualize a lot more. I had an apartment & shopped in the town where Goddard Space Flight Center is located. Several other places I have either been to or are familiar with. There were several places that I would love to go back and visit now that my interest is piqued.
My physics & math & computer genius freak-show of a brother had interned, and then worked at & visited many of the places in the book–JPL, APL, Goddard, etc.. So proud of his crazy work, and so cool that he has that brain to do what he does!