Mount Gusuku is a place in the country of Japan. It is a big hill or mountain that has a lot of special things on it. People used to live on Mount Gusuku a long, long time ago. They built special walls and buildings out of rocks and stones, and they used these walls to protect themselves from bad guys.
Nowadays, people still go to Mount Gusuku to learn about the people who used to live there a long time ago. They can see the special walls and buildings that those people built, and they can learn about the things that they did for fun and for work. People can also take hikes on Mount Gusuku, which means they can walk up and down the big hill and see all the special things along the way.
So Mount Gusuku is a really special place in Japan where people can learn about the history of the people who used to live there a long time ago by seeing and exploring the special walls, buildings, and other things that they left behind.