'Watchtower' in the Bible

He plowed its land and cleared it of stones. Then he planted it with the choicest vines, built a watchtower in the middle of it, and dug a wine vat in it; He expected it to produce good grapes, but it produced only wild ones."

Prepare the table, watch in the watchtower, eat, drink: arise, ye princes, and anoint the shield.

And he cried, A lion: My lord, I stand continually upon the watchtower in the daytime, and I am set in my ward whole nights:

For the palace will be forsaken,the busy city abandoned.The hill and the watchtower will becomebarren places forever,the joy of wild donkeys,and a pasture for flocks,