Halong is closely attached to important historical milestones of Vietnam from the establishment stage to the present time.
During the 12th Century, Van Don Port in Halong used to be the busiest port in Northern Vietnam, which soon welcomed foreign traders in the neighbour areas come to trade specialties of the local countries. Van Don Port is especially convenient for business activities that attract a lot of international traders thanks to a system of ground, islands, and rocky islands that separate Halong Bay into smaller lagoons and deep canals, which are all airtight for ships and boats docking safely.
Besides Van Don Port, Halong has the famous Bai Tho Mountain (Mountain of Poem), which preserves the valuable poet of King Le Thanh Tong engraved on its cliff in 1468, on the occasion of his trip to the East Sea; and the hand-writing of Lord Trinh Cuong in 1729.
Bai Chay in the Western side of Halong Bay recorded the victory of Tran Dynasty for burning the battleships of the Mongol invaders, and Dau Go Cave is the historical vestige of Lord Tran Hung Dao triumph on Bach Dang River. Hundreds of vestiges in Halong combine together and the imagination of local people have built up many interesting legends of the bay.
Talking about the traditions and customs of Halong, Hát Giao Duyên (a variable of the local folk singing) could be said the most unique feature, which is belong to fishermen in Cửa Vạn fishing village. This type of traditional folk singing includes Hát Đúm, Hò Biển, and Hát Đám Cưới, in which Hát Đám Cưới (wedding singing) is still remaining and preferred by the local as their pride.
Elders in Cửa Vạn Village say their wedding singing is not less pleasant and attractive compare to the famous Quan Họ Singing in Bac Ninh Provine. Additionally, all the wedding in Cửa Vạn Village are organized in the 15th day of a lunar month when the Moon bright the whole bay with its gentle light that make all the fishes stay deep under the sea.