I guess sieges just died out.
Sieges Even ended in 1997.
Antrim Castle ended in 1922.
Fotheringhay Castle ended in 1627.
Worcester Castle ended in 1826.
Dargun Castle ended in 1552.
Castle Communications ended in 2007.
Tachibana castle ended in 1601.
Dorchester Castle ended in 1309.
My House My Castle ended in 2009.
Buittle Castle ended in 1595.
What ended the Middle Passage
Oxenfoord Castle School ended in 1993.