Torre del Oro
Spain
The 186th tallest tower in the world
The Torre del Oro (burj aḏẖ-ḏẖahab, lit. 'Tower of Gold') is a dodecagonal military watchtower in Seville, southern Spain. It was erected by the Almohad Caliphate in order to control access to Seville via the Guadalquivir river. Constructed in the first third of the 13th century, the tower served as a prison during the Middle Ages. Its name comes from the golden shine it projected on the river, due to its building materials (a mixture of mortar, lime and pressed hay).
Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).