2 Chronicles 26:9
Moreover Uzziah built towers in Jerusalem at the corner gate, and at the valley gate, and at the turning of the wall, and fortified them. Moreover Uzziah built towers in Jerusalem at the corner gate, and at the valley gate, and at the turning of the wall, and fortified them.
Moreover Uzziah built towers in Jerusalem at the corner gate and at the valley gate and at the turning of the wall, and fortified them, thereby strengthening the defenses of Jerusalem. His work was building and fortifying towers at the city's gates and where the wall turned.
Towers of this kind were defensive strongholds and lookout stations typically built into the walls of fortified cities.
The verse belongs to the account of Uzziah's reign when he sought God and prospered, and his building is counted among his accomplishments for Judah and Jerusalem in prosperity and strength. That reign is counted among the reigns of the good kings.
The same account goes on to record his later pride and disobedience leading to his downfall, showing that prosperity and strength did not keep him from turning away from God. His later presumption is noted as a mistake.