How have castles changed over time?

theyve changed in size (olden day have gotten smaller-ruins but recently built will wear down longer, become more resistant, larger for longer)

royalty (royalty dont neccesarily live in castles nowadays, when back then they did.)

your welcome :)

call me superwoman :)

There is also the additon of a secret, sex chamber in Buckingham palace which is now very common in modern castles unlike in old fashioned castles.