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!

Hi Dear, I think travel to is about going toward a destination like I am traveling to Japan while travel in is about moving around within a place like I love traveling in Europe. Using different services example like VipRide4U Limousine can make traveling in a city much smoother especially when exploring different areas.Do you notice one of these is used more often in daily conversation?

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