Watch tower

Rising high above the treeline, watch towers resemble primitive huts laced with animal bones and giant tusks of every kind. These insubstantial — but highly useful — lookout posts are ideal for spotting the human forces from above, making them a desired part of any Orcish settlement’s defenses. These emplacements may be upgraded to loose deadly projectiles upon any approaching enemies, or to rain explosive death down upon their foes on land and sea...

Watch towers can be used to guard embattled orcish settlements, and provide static defense against land and air attacks.

Troll watch towers can be found in Stranglethorn Vale (Such as at the gates of Zul'Gurub), and in Tanaris (At Sandsorrow Watch). This may show that watch towers are at least partly of troll origin.

The Centaur Marauders also had access to watch towers.