The China Tourism Office in Seoul recently launched an online exhibition on Yongding's tulou. [Photo provided to Chinaculture.org]

The China Tourism Office in Seoul recently launched an online exhibition on Yongding's tulou. These large, communal buildings made of earth are cultural landmarks of Yongding county in Longyan city in East China's Fujian province.

Yongding, which has the most tulou, is home more than 23,000, representing 70 percent of all such buildings in Fujian. In 2008, tulou landed on the World Cultural Heritage List.