Palace Museum building new underground warehouse for relics

Hundreds of thousands of national treasures housed in the Palace Museum, also known as the Forbidden City, will soon find a more protective home underground.

Construction of a third underground warehouse for cultural relics began at the museum on Tuesday.

The Forbidden City was China's imperial palace from 1420 to 1911 - the Ming and Qing dynasties - and houses 1.86 million cultural relics.