Hoa Lu was the fortified capital of Vietnam under the Dinh and Early Le dynasties in the 10th century — the country's first independent capital after a thousand years of Chinese rule. The royal city occupied a natural fortress: a tight valley encircled by sheer limestone cliffs that served as ready-made walls, supplemented by earthwork ramparts and moats.
Almost nothing of the original palace complex survives, but two temples remain in the valley: Dinh Tien Hoang Temple, dedicated to the dynasty's founder, and Le Hoan Temple, honouring his successor. Both are modest but atmospheric, set among old trees with stone dragons and incense smoke. The mountain backdrop makes the whole site feel ancient and enclosed in a way that larger, more visited sites rarely do.
Hoa Lu is best combined with Trang An, whose boat circuit departs from the adjacent valley. Together they make a full day's outing from Ninh Binh.