User blog comment:Ronshol The Black/A WALL!! A MAJOR STRUCTURE!?!?!?!?!?/@comment-26298013-20151227184513

Certainly interesting. The tower and wall are made of different materials--the Ents smashed the walls but couldn't touch the tower.

But why, oh why, cobblestone?

At least make it out of a smoother rock. Think Gondorian bricks or similar--after all, Gondor was responsible for the building of the wall and tower.