The [Tower of the Winds](https://en.wikipedia.org/wiki/Tower_of_the_Winds) is located in [Athens](https://goo.gl/maps/WToSEa22R5w) and was built in the 1st century BCE.
This model was constructed in SketchUp using measurements provided by Kienast in *Der Turm der Winde in Athen* and Stuart and Revett in *The Antiquities of Athens*.