Where is the earth building that was first rated as a World Heritage Site?

In Nanjing County, Yongding County and Hua 'an County of Fujian Province, it successfully applied to become a world heritage in July 2008.

Fujian Tulou, also known as Fujian Hakka Tulou. Tulou is mainly made of earth, wood, stone and bamboo. They are made by mixing unbaked sandy clay and clayey sandy soil according to a certain proportion, and compacted by sandwich board.

Fujian Tulou originated in Song and Yuan Dynasties and matured in the late Ming and early Qing Dynasties and the Republic of China. The oldest and youngest round buildings in the world heritage earth buildings are located in Tunxi earth buildings in Yongding. Qing Ji Tower with a diameter of 66 meters has a history of 600 years, while Shanqing Tower with a diameter of 3 1 meter has a history of only 30 years.

The formation of Fujian Tulou is related to several famous Han immigrants from the Central Plains in history. During the Yongjia period of the Western Jin Dynasty, that is, in the 4th century, wars and natural disasters frequently occurred in the north, and the local people moved southward on a large scale, which opened the prelude to the continuous migration of Han people from the Central Plains to Fujian for thousands of years.

Fujian tulou is the most widely distributed, the largest number, the richest variety and the best preserved tulou. It is a symbol of Hakka culture, so Fujian Tulou is also called "Hakka Tulou". Fujian Tulou is a unique form of large-scale residential buildings in the world, and it is called the treasure of traditional residential buildings in China. On July 6, 2008, it was officially listed in the World Heritage List at the 32nd World Heritage Conference held in Quebec City, Canada.