By the end of the 19th century and early 20th century, many excavations on the ancient citadel of Thang Long had been deployed. Many objects made of ceramic and terra-cotta were discovered and sent to the Louis Finot Museum, now the Vietnam National Museum of History. Many are inscribed with the place of origin as Quan Ngua, Ngoc Ha, Van Phuc, Huu Tiep, Kim Ma, Cong Vi, Lieu Giai that bearing the characteristics of Ly-Tran Dynasties. Many objects of which have been registered as the national treasures and now are on display at the permanent exhibition system of the VNMH Museum.