Made of boulders weighing 4 to 5 tons , the 3,700-year - old wall is 30 feet high . Archaeologist : ` ` I do n't know how to do it properly without mechanical equipment '' JERUSALEM ( CNN ) -- The wall appears to have been used to defend passages that used to spring . It is believed to have been built by Canaanites .
Made of boulders weighing 4 to 5 tons , the 3,700-year - old wall is 30 feet high . Archaeologist : ` ` I do n't know how to do it properly without mechanical equipment '' The wall appears to have been used to defend passages that used to spring . It is believed to have been built by Canaanites .