Six months' worth of travel is necessary for every major-league team. They travel all around North America, thousands of miles a year.
Some teams travel more than others. You can see exactly where teams go on this interactive map from Baseball Savant.
I'm posting this because I found it interesting, and it's an otherwise slow day, and the Cubs will travel the third-fewest miles of any major-league team in 2015. As you can see at the link, nine of the 10 Central Division teams are the clubs that travel the least. Only the Pirates, who are the farthest east of any team in the two Central divisions, have a couple of teams in between them and the Central clubs.
For 2015, this is largely because the interleague schedule calls for the N.L. Central to play the A.L. Central, cutting down on the distance between interleague opponents. And even though the same matchups are in place for other divisions (East vs. East, West vs. West), the West division teams travel the farthest. It shouldn't surprise you to see that the Mariners travel the most miles, more than twice as many as the Cubs.
If you think this isn't important to some players, the Cubs made it a point in their presentation to Jon Lester:
The presentation started with Wrigley Field renovations, a chat with community relations officials and how they could help the Lesters' charity, how the Cubs take care of players' families, briefings on the Cubs traveling the fewest miles and local media.
Anyway, beyond that, I just thought this was interesting. You can play around with the map to see the travels of every team, both this year and for each season since 2009.