China

It took over a million workers and fourteen years to complete the Forbidden Palace.

It was built for Zhu Di (the 3rd Ming Emperor) after he moved the capital to Bejing. Over the following 500 years it was home to another 13 Ming emperors and 10 Qing emperors including Henry Pu Yi (last Emperor of China).

Today the Chinese refer to it as the "Former" Palace. It is currently in the midst of a 16-year project to return it to pre-1912 condition (when Emperor Puyi was evicted).