Learning about different cultures is important, especially in view of the workplace becoming increasingly globalised. In order to be interculturally competent (the ability to communicate effectively with people from different cultures) the communicator should have a proper understanding of different cultures and should be able to identify not only the differences but also the commonalities between cultures. A bi- or multi-cultural approach often focus only on the differences but all expats and TCK's are able to also point out the commonalities among themselves and among different cultures.
The best way to learn about the world is most definitely living among different cultures. One of the character traits of Third Culture Kids is the fact that they develop a three dimensional, whole world view. Travelling certainly will broaden perspectives. That said, the world has flattened significantly and the global has become local and vice versa