"An observation tower is a structure used to view events from a long distance and to create a full 360 degree range of vision to conduct long distance observations. Observation towers are usually at least 20 metres (66 ft) tall and are made from stone, iron, and wood. Many modern towers are also used as TV towers, restaurants, or churches. The towers first appeared in the ancient world, as long ago as the Babylonian Empire.
Observation towers that are used as guard posts or observation posts over an extended period to overlook an area are commonly called watchtowers instead." - (en.wikipedia.org 16.05.2021)
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