城楼,或称作城门楼子,是指设在上用来瞭望的楼台。《后汉书·卷十六·邓禹传》:“从至广阿,光武舍城楼上,披舆地图。”城楼有时作为城堡主城的一部分,有时则作为城墙的防御要塞,多设制于城墙的四角或城门上方。

古长安城楼

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