A castle is like a super cool fort that was built a really long time ago when people needed to protect themselves from enemies. Castles in Sardinia are special ones that are found on a beautiful island called Sardinia in Italy.
The people who built the castles in Sardinia were really good at making walls and towers that were super strong and could keep bad people out. They also built castles on top of hills or by the sea so that they had a good view of the land and could see any trouble coming from far away.
These castles had secret passageways, drawbridges, and other cool things to keep the people inside safe. People who lived in the castles had everything they needed like water, food, and even stables for their horses. They were also very good at making weapons to defend themselves if there was any trouble.
Today, people go to visit the castles in Sardinia to learn about what life was like back then and see the cool structures that were built so long ago.
So, in summary, castles of Sardinia are really old forts that were built to protect people a long time ago. They are super cool and have things like secret passageways and drawbridges to keep people safe. People visit them today to learn about history and have fun exploring!