You can travel by hitchhiking (free), walking (free), cycling (one bike costs) or even by volunteering on a ship (you might even earn money). You can sleep in a tent or couchsurfing or on said ship.
Everybody immediately goes to restaurants, transcontinental flights and hotels, of course you need money for that, but that’s exactly not the point.




My point is: it’s not technically correct, it’s just plain correct. Plenty of people I know go for cycling tours of Europe, packing food and sleeping in tents. Some do two weeks hiking.
Travel is not only flying to the other end of the world and eating fancy food cooked for you by hired chefs… you can travel basically free if you adjust your expectations.