Santa Maria in Calanca Castle
Switzerland
The 186th tallest tower in the world
Santa Maria in Calanca Castle (Torre di Sta. Maria) is a tower in the municipality of Santa Maria in Calanca of the Canton of Graubünden in Switzerland. It, along with the neighboring Church of the Assumption of St. Mary, are both Swiss heritage sites of national significance.
Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).