Angular Air-Purifying Buildings

It's not often that a city's modern infrastructure can have a positive impact on the environment, making Berlin's new air-purifying building an major feat of architectural genius.

'Sapphire,' built by Daniel Libeskind, is a geometric, technologically infused complex in Berlin's city center that can clean not only itself, but the air around it. The stoneware tiles that cover the building have been coated in a layer of titanium dioxide -- when this layer is exposed to the sun's UV rays, it breaks down dirt and grime. The interior of the apartment complex is as eye-catching as the exterior, as each unit features a unique floor plan, with bold windows individually fitted to fulfill the architect's vision.

Aside from the building's innovation, its irregular but interesting angular facade makes a wonderful addition to Berlin's famously unique urban landscape.