It's main purpose was to provide a high, safe place from which a guard may view the surrounding area. Its primary used was military. Modern day, non military use, allows for example, observers to keep a look out for fires
The Watchtowers are guardians of the North, South, East, and West. During ceremonies, Pagans draw upon the four Watchtowers and ask them for protection during the rituals.
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Japan.
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tou see incoming enemies from far away
They're watchtowers and beacon towers
They built forts and watchtowers.
In history, watch towers were an important part of military protection plans. Most castles and important buildings had prominent watchtowers from which guards could see a great distance and be able to warn of impending enemy attack.
100 yards apart from each other
The perimeter , defensive corners , mountain ridges , the sides of a defile , points of highest elevation ,
The Great Wall of China is made up of many sections of wall that were built at various times. One would have to research each of the many sections to get that total. One website (see Related Links) declares that there are over 10000 watchtowers and beacon towers.
200 BC they were made out of wood. Later in the 14th century they were made out of stone.