The shimmering, 23-foot tall park tower shown below is more than architecture. It's the largest air purifier in the world, able to filter 75% of harmful particles from the surrounding air, and producing 30,000 cubic meters of clean air per hour. This creates a bubble of clean air around the tower, offering smog-free solace to urban dwellers in Beijing, where breathing untreated air is equivalent to smoking 17 cigarettes each day.


The tower uses very little electricity, about as much as an electric kettle, and the electricity that it does use comes from wind power. Best of all, the filter sucks tiny particles of carbon from the air and turns the substance into diamonds which are used to make jewelry that is sold to help finance construction of new towers.