Tower topic

Towers are tall human-made structures that are always taller than they are wide, usually by a significant margin. Towers are generally built to take advantage of their height, and can stand alone or as part of a larger structure. Towers have been used by mankind since prehistoric times. Some of the earliest surviving examples are the broch structures in northern Scotland, which are conical towerhouses. The Chinese used towers as integrated elements of the Great Wall of China as early as about... full article at wikipedia