Caisteal Grugaig
United Kingdom
The 186th tallest tower in the world
Caisteal Grugaig (or Dun Totaig) is an Iron Age broch near the eastern end of Loch Alsh in the Scottish Highlands (grid reference NG86682508).
Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).