1. I'm going to travel in Europe this summer vacation.

Question

2. I'm going to travel to Europe this summer vacation.

(What is the difference between the two setences? Are "travel in," and "travel to" interchangable?)

Answer 1

Both sentences mean about the same. The implication for 1 is that you'll visit several countries while you're IN Europe. The 2nd sentence states that you're going TO Europe, but says nothing about going to more than one country.