Metzad Avinadav - Aerial Views (BibleWalks.com)

Ruins of a Roman stronghold that guarded an ancient route descending the eastern foothills of Mt. Gilboa, south of Nahal Zviyah and 2.5km west of Horvat Migda. On the hilltop are remains of a rectangular building, The structure is built of large roughly hewn stones, with 1.1m wide walls, covering an area of 20 x 40m. Inside the compound are rooms, thin walls from a later phase and a small lime kiln. Ceramics collected on the site date it to the late Roman period (3rd-4th centuries AD).
Three cisterns, hewn into the cliff west of the site, were used for the water supply of the fort. Two troughs were cut near one of the cisterns.
An ancient Bronze/Iron age road, Dorsey's T11a, ascended from Jenin (Beth-Haggan in Samaria), via Beit Kad to the nearby Jalbun. It passed at this location, descending to Tell Migda in the Jordan valley. The route continued to be in use in Roman and Byzantine periods.
You can reach the site by foot from highway 667 - 400m walk from the windmill farm.
The name commemorates Avinadav - one of the sons of King Saul who were killed during Saul's fatal battle with the Philistines. (1 Samuel 31: 2): "And the Philistines followed hard upon Saul and upon his sons; and the Philistines slew Jonathan, and Abinadab, and Malchishua, Saul's sons".
References:
N.Zori - The Land of Issachar - site 25 (Mezad Aleph)
https://survey.antiquities.org.il/ind...
https://www.biblewalks.com/migda - site on the bottom of the descent (2.5km east)