Feu Hugon tower
France
The 186th tallest tower in the world
The Feu Hugon tower, now defunct, is presumed to be the first medieval residence of the Counts of Tours, built around 875, although it may be later and distinct from the Palais Comtal (below), all located in the northeast corner of the ancient Gallo-Roman Cité.
Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).