Anybody who was skilled enough(artists,carpenters,etc)it tended to take many years(it was all hand done) but many things are still a mystery to us.
Because before gunpowder castles were virtually impenetrable. They were very good fortresses.
kings and feudal lords
They were damp for several reasons. They were usually built in damp climates. The middle ages was an era of unusual cold for Europe. They lacked central heating to help dry the damp, and they were...
they served as look out points on and inside of the border incase of an attack.they also served as the first line of defence if a war broke out.