Okay kiddo, let's talk about the Hierapolis Sawmill! Does the word "sawmill" sound familiar to you? It's a place where people use big machines to cut wood into smaller pieces.
Now, the Hierapolis Sawmill was a very special sawmill that was built a very long time ago, back when people used to live in a place called the Roman Empire.
The Hierapolis Sawmill was built near a big waterfall. This was because they could use the power of the waterfall to make the big machines work. Sort of like how you use your energy to play and run around!
People used to work at the sawmill and they would cut big logs of wood into smaller pieces that people could use for things like building houses and making furniture.
Now, the Hierapolis Sawmill isn't around anymore. It's a very old place and it hasn't been used for a very long time. But people still visit it because it's a very special and important place in history. They can see what the sawmill looked like long ago and learn about how people used to live and work in the Roman Empire.