Collocations for castle - noun

grand, great, magnificent, splendid (esp. BrE)
turreted, walled
historic
ancient, medieval
royal
ruined
fairy-tale, fantasy

build, fortify
attack, besiege, lay siege to, storm
capture, seize, take
defend, hold
The castle was held by an opposing faction.

perch, stand
The castle perches on a high rock.

overlook sth
The castle overlooks the town.

gate, grounds, keep, tower, wall
ruins

in a/the castle