Hi Silver! The preposition "to" indicates that you're traveling /to/ the destination. The preposition /in/ is generally used as a preposition when discussing you're transportation. If you want to talk about traveling around a country or destination once you're there, you'd likely use "within" or "around" to express that. For example: I'm in the United States right now, but next week I'm traveling *to* Germany. Once I'm there, I'll travel /in/ a car. Because I've rented a car, I'll be about to travel /around/ Germany easily. There's a lot to see when traveling /within/ Germany!

you travel to a place like a tourist spot...and you travel in a vehicle like a car/train/bus