Co Loa Citadel Travel Guide – Overview, Attractions & Visiting Timings

Thành Cổ Loa, also known as the Ancient Citadel of Cổ Loa, is one of the most important historical and archaeological sites in Vietnam. Located in Cổ Loa Commune, Đông Anh District, about 17 km north of Hanoi city center, this ancient fortress dates back to the 3rd century BC and was the capital of the Âu Lạc Kingdom under King An Dương Vương. Famous for its unique spiral-shaped earthen walls, Thành Cổ Loa showcases advanced military architecture of ancient Vietnam. Today, it is a popular cultural and tourist destination, attracting visitors interested in Vietnamese history, ancient architecture, and heritage tourism near Hanoi.