3D model of St. Michael's Church, Hildesheim. I'm not usually into churches but this one is pretty awesome. It's pretty geometric shapes have fascinated me since growing up as a child in Hildesheim. It's a UNESCO World Cultural Heritage site and is now about a thousand years old.
This model is based on the one on Google Earth, made by "googlenaut":
It prints at a scale of 1:1000. Printing at 66% model size produces even cuter churches. :)