Either intentionally or unintentionally. Include location and sculptor, if known.
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George Green's windmill in Nottingham has a sculpture with a mill wheel with Green's Theorem carved into it. 


Perhaps these are too small to count as sculptures, but there is quite a respectable collection of models of mathematical objects on display in the Mathematical Institute in Goettingen. 


The french sculptor Bernar (sic) Venet: see http://images.math.cnrs.fr/BernarVenetdelartetdes.html 


Here are some sculptures by Henry Segerman: https://plus.google.com/u/0/photos/102006004474081559466/albums/5946201022131183089 

