World's Largest Solar Energy Office

Where: Dezhou in Shangdong Province, China

The office building that took shape from a sun dial is 75,000 square meters. It houses multiple exhibition centers, scientific research facilities, meeting and training facilities, and a hotel, which are all run by solar power from the many panels tha cover the roof of the office. One fun fact is that the external structure of the building used 1% of steel used for making the Bird's Nest for the lats olympic games.