The Dutch Windwheel is a giant proposed wind turbine for the city of Rotterdam in the Netherlands, which will feature apartments and hotel rooms along the outside of the structure.

Artist's images of the Windwheel at night look a little like a Stargate or the eye of Sauron, but the designer's vision for the circular skyscraper is more sustainable than storybook.

The central area of the building would be occupied by a power generator that harnesses the wind to produce electricity. Unlike other wind power systems, the system, EWICON, uses no moving parts, relying on the wind to push charged particles in particular directions to generate energy. Check out this video to get a more in-depth explanation.