Yankee Casting specializes in aluminum, bronze, and magnesium sand castings.  Sand castings are made by pouring molten metal into a sand mold.  The metal solidifies and the sand is removed.  The  resulting metal shape is the casting.  To the right is a photo of how internal passageways are made. 

Picture of a clock post made for town greens.

Here is a picture of the left hand side of a bench that will go to the Children's Hospital in Hartford, CT  (If you cant tell what it is its a frog catching a fly).