Okay, so there is a special group of people in Sri Lanka who study things that happened a very long time ago. They are called the Department of Archaeology.
Archaeology is kind of like a big puzzle. Instead of putting together a picture, archaeologists try to figure out what used to happen a long, long time ago by digging up old things like buildings, tools, and even bones.
The Department of Archaeology in Sri Lanka has lots of experts who know a lot about history and how to dig up old things carefully so they don't break. They go to different places in Sri Lanka where they think there might be old stuff buried under the ground. Sometimes, they even find ancient cities that nobody knew existed before!
These archaeologists also try to understand how people used to live a long time ago in Sri Lanka. They look at the old buildings and tools and try to figure out what they were used for. Sometimes, they even find old writings on rocks or walls that tell them stories about what life was like back then.
The job of the Department of Archaeology is really important because it helps us learn about our past and the cultures that came before us. By understanding our history better, we can appreciate and learn from it.