I found a pretty cool (and I think useful) website called thetruesize.com. It allows users to accurately compare the sizes of states and countries (which are obviously massively distorted on globes).
I think this can help us as writers because it gives us a sense of how large things are compared to places we know. It's difficult to get a sense of how big Spain, The Netherlands, Brazil, or Bangladesh are, without having lived there. Fortunately, with this site, we can get a clue.
For example, Spain is slightly smaller than Texas (which doesn't seem accurate in my mind):
The Netherlands is much, much smaller than the state of Utah (how can that be?):
It turns out that Brazil is really, really big:
And Bangladesh, with its 172 million people, is half the size of New Mexico, with its population of just over 2 million:
I think this tool can not only help us with travel times, but it can give us a better sense of population densities as well. I'm definitely adding it to my writing research folder.