Bible Verses About Towers: On the walls of cities

"Let's build these cities," he said to Y'hudah; "we'll surround them with walls, towers, gates and bars. The land is there for us to use, because we have sought ADONAI our God; we have sought him, and he has given us peace on every side." So they built and prospered.

'Uziyahu built towers in Yerushalayim at the Corner Gate, at the Valley Gate and at the Angle, and fortified them.