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A watchtower or watch tower is a type of fortification used in many parts of the world. It differs from a regular tower in that its primary use is military and from a turret in that it is usually a freestanding structure. Its main purpose is to provide a high, safe place from which a sentinel or guard may observe the surrounding area. In some cases, non-military towers, such as religious.

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Jul 20,  · Top 15 Facts about the Great Wall of China *Originally published by Lilian on April and updated by Lilian on July The Great Wall of China is estimated to be 2, years old. The emperors that rule added new fortifications such as watchtowers and platforms to the wall. This dynasty built more than 4, kilometres (2, miles) of.