a structure taller than its diameter; can stand alone or be attached to a larger building

a large building formerly occupied by a ruler and fortified against attack

A spire, usually comparatively small and slender, above the ridge of a roof, particularly one rising from the intersection of the nave and transept roofs of Gothic churches.

an overhanging, wall-mounted turret projecting from the walls of medieval fortifications (most frequently found at corners) from the early 14th century up to the 16th century.

a large building formerly occupied by a ruler and fortified against attack