tower — A tall, narrow structure, either freestanding or forming part of a building

a brave knight climbs a winding staircase that spirals up the exterior of a massive stone tower. The tower rises high into the sky, much taller than the surrounding castle walls and buildings. At the top of the tower, a princess waves a colorful banner from a small window. The knight pauses halfway up, looking toward the distant top of the structure. Castle guards below point upward at the impressive height of the tower. Other castle residents gather in the courtyard, craning their necks to see the top. a tall, narrow structure that stands much higher than everything around it