KnowraWatchtowerLinked fromLinked fromThe 3 pages that link to Watchtower, each with the reason it gives.All 3Broader topic 1Related 1Narrower topic 1Great Wall of ChinaBroader topic: Watchtowers gave defenders sightlines over approaches and places to hold the line.Jiayu PassRelated: Elevated surveillance helped defenders monitor approaches to the fortress.Maiden’s TowerNarrower topic: The tower’s elevated position allowed surveillance of traffic entering the Bosphorus.