Japan has been isolated throughout most of its history. This is mostly due to the fact that Japan is an island nation separated by hundreds of kilometers / miles of sea between them and the nearest country.
Before the modern era, Japan has rarely had contact with other countries than China and Korea. This has heavily influenced their culture. From the writing system, to tea ceremony, and even Religion; their relation with China has contributed to what Japan has become today.
Nowadays, Japan is one of the world’s top economic powers, with tens of millions of tourists attracted to this mysterious and ancient country.