castle tower; donjon
Refers specifically to the central, tallest tower of a Japanese castle. Often used in the compound 天守閣 (てんしゅかく) with the same meaning.
See also: 天守閣 (てんしゅかく)
The castle tower of Himeji Castle is designated a national treasure.
From the castle tower, you can get a panoramic view of the castle town.