Silesia walls are walls that were built a very long time ago in a place called Silesia. Silesia is a region in Europe, where many people used to live a very long time ago. These walls were built to protect the people who lived there.
Imagine you are playing with your blocks, and you want to make a castle. You stack up the blocks as tall as you can, so it is hard for anyone to get inside. That's what the people in Silesia did, but instead of using blocks, they used big rocks and stones. The walls were really tall and strong, so if anyone tried to attack the people living inside, it would be very difficult.
The walls were also very long, because they had to go all the way around the places where the people lived. Think about when you play in the park with your friends, and you want to make a big circle around everyone. That's what the walls did around the houses and towns in Silesia.
The walls were built a long time ago, and many years have passed since they were first built. But some parts of the walls are still there today, even though they are very old. People can visit these walls and see how strong and amazing they are. It's like looking back in time to see how things were a long time ago.