Covering an area of over 7,400 square meters, the 200-year-old fortress-like complex is rectangular in shape and consists of 18 halls and several dozen smaller rooms.

"Its architectural structures are particularly impressive and unique, which you can't find elsewhere," said photographer Gui Xiong during his recent trip to Longnan in late September.

Gui took part in an aerial photography contest, which was organized by the Ganzhou government and the China News Service to help promote tourism.

"More people will know about the cultural heritage of Ganzhou through these photographers' works," said Zeng Jiangming, a local publicity official.

Longnan is bidding to host the 32nd World Hakka Conference in 2021, which is one of the biggest gatherings for Hakka people around the world.