Gotham Manhole Cover
This is a full-size replica of the manhole covers used in Batman Begins. They were featured prominently in the film in the third act when they were being blown sky high from an exploding sewer system. I love this design. Mine is made of multiple layers of a thick plastic that I had waterjet cut. The various pieces are then glued together and the entire thing is painted and weathered to look like an old street-worn manhole cover.