An aerial view of four enormous tiled-roofed tulou, a traditional architectural form of the Hakka people of southern China, surrounded by terraced fields in myriad shades of green. Three of the tulou are square, with large square courtyards at the center of each, and the fourth is round, with a vast circular courtyard at the center.
南靖土楼, by Yang Yu (CC BY-NC-SA 2.0)