Stone Tower (IMAGE) Weizmann Institute of Science Caption Recently uncovered remains of a massive stone tower built to guard Gihon Spring -- a vital water supply just downhill from the ancient city of Jerusalem. Credit Weizmann Institute of Science Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.