A Round Keep was one of the strongest castle designs. A round tower would not have any sharp corners that prevented the view of the archers. It would provide a broad view for the soldiers. There would also not be any weak corners that the enemy could tunnel under and collapse a wall. Also, a Round Tower would allow enemy missiles to bounce and slide off the smooth walls.
Stone keeps are built on top of a hill to get the vantage point.
stone
The stone keeps supported to look after all the movement around the castle and it protected everyone who lived there
1078
Normans
To make them stronger and stone is a very strong material
the key feature of a square keep are the turrets stone wall
all over England on hills
Stone keeps
They are about two meters thick.
ramsbottom hahah bottom hallarious
It keeps the Pokemon holding it from evolving.