Devil's Lake Wastewater Treatment Plant, North Dakota

Relying on natural decontamination processes instead of chemical agents, Viet Ngo's "Lemna System" utilizes a variety of floating plants to remove harmful phosphorus, nitrogen and algae in water before it is released into a bay of Devil's Lake. Shaped in the form of a long, windy road or a coiled serpent, this site has attracted much attention from environmentalists, artists, and the general public as a role model for the natural reclamation of water.