Ryokan has been existent since the Edo Period. There are more to the history of Ryokan that made it reach such popularity and credibility.
This site will provide you with the details that go with choosing to stay in Ryokan. From here, you will see that it is, definitely, more than just a simple place to stay in for tourists or travelers. There are more to it that people should take time to know and see for themselves.
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