If you've watched the trailer for the famous Disney movie, Mulan, surely, you've noticed the main character's home. Round and much like a fort, built with clay and sandy soil, the buildings are called Fujian Tulou. This was a type of shelter that is built by the people of the migratory tribe called Hakka. UNESCO recognized this cluster of buildings as a World Cultural Site in 2008. The satellite images of the cluster of buildings brought about some interesting conjectures, especially during the Cold War. Some of the countries in the west thought the site was China's nuclear missile silos.