'Tower' in the Bible

And the watchman stood on the tower in Jizreel, and saw Jehu's company as he came, and said, I see a company. And Joram said, Take a horseman, and send to meet them, and let him say, Is it peace?

And the children of Israel did secretly against Jehovah their God things that were not right; and they built them high places in all their cities, from the watchmen's tower to the fortified city.

He smote the Philistines unto Gazah and its borders, from the watchmen's tower to the fortified city.