150 soldiers and officers of the IDF Paratroopers brigade have excavated a 2,700-year-old watchtower near Ashkelon, that was standing when the Jewish King Hezekiah ruled Judea. Archaeologists believe the tower was used to transmit messages via beacons.
https://hike-israel.com/2019/06/20/watch-tower/
https://unitedwithisrael.org/idf-discovers-watchtower-dating-back-to-kingdom-of-judah/