Animal, vegetable or mineral?
This man-made structure can be found in a disused clay pit in Cornwall, U.K., where it forms the centerpiece of the Eden Project. It is an incredible piece of architecture - the world's largest geodesic domes interlocking to form the most awesome greenhouse a gardener could imagine.

The Eden Project aims to tell the story of man's relationship with and dependence on plants. This is accomplished through a wonderful fusion of art and science. 

Scientific aspects of the construction of the Eden Project are illustrated here.

Clockwise from top left: the structure of the geodesic dome; the pillows that inflate and deflate to control temperature; the geothermal imaging used to position the biomes so that some areas are temperate, others tropical; and adjacent domes intersecting in vertical planes like soap bubbles.

Thought-provoking artwork is used throughout Eden to tell the plant stories.

Clockwise from top left: Flexiplants by David Kemp - flowers made from recycled plastic tubing used in construction.
Bush Banana Dreaming by Eunice Napangardi, an Australian Aborigine.
The Huichol World-view by Motaapohoa, a Huichol Indian. (Both of the above images were sourced by the October Gallery for the Eden Project.)
Liquid Gold by Elaine M. Goodwin - a mosaic pathway through the Olives exhibit in the Warm Temperate Biome.