'Tower' in the Bible

And the watchman on the tower in Jezreel saw Jehu and his band coming, and said, I see a band of people. And Joram said, Send out a horseman to them, and let him say, Is it peace?

And the children of Israel did secretly against the Lord their God things which were not right, building high places for themselves in all their towns, from the tower of the watchmen to the walled town.

He overcame the Philistines as far as Gaza and its limits, from the tower of the watchman to the walled town.