Unless your entire travel segment goes “it takes three weeks, and you arrive in the next city”, you are going to need something about where you are travelling through. Even in the city, the local environment has an effect – on architecture, on clothing, even on the demeanor of the inhabitants. Compare Alexandria with Venice with Oslo. The ancient versions, not the skyscraper forests. Any era before air conditioning and central heating, where you live affects you.
But the environment is particularly relevant to those who leave the city and explore the wildernesses – notably adventurers. Hacking through a forest, isn’t quite the same as punting through a swamp, sailing a boiling sea, or trekking through the desert.