Okay kiddo, let's talk about a castle chapel!
Do you know what a castle is? It's a big building that usually has walls and towers around it to protect the people inside. Sometimes a king or a queen lives in a castle.
Now imagine that inside the castle walls, there is a special room called a chapel. This is a place where people go to pray and worship. It's like a little church inside the castle.
The chapel might have very tall ceilings and lots of windows to let in the light. There might be pretty decorations on the walls, like pictures of saints or angels. There might be candles burning and flowers on the altar.
When people want to have a special ceremony, like a wedding or a baptism, they might have it in the castle chapel instead of a regular church.
So, a castle chapel is a special place to worship inside a castle. It's like having a church right in your own home!