Deputy Prime Minister Vu Duc Dam attended the ceremony. At the event, Deputy Prime Minister Dam spoke highly of the cultural and spiritual values that the 2 sites hold. Spanning over 100 hectares within Tam Dao National Park, the Tay Thien site is dotted with beautiful forests, waterfalls, grottoes and dozens of religious buildings. The Tay Thien Festival, which is held annually on the fifteenth day of the second lunar month to commemorate Mother Lăng Thị Tiêu, who according to legend made a great contribution to the country during the time of the Hung Kings period, attracts large crowds. The 13th century Binh Son Tower also lures a great number of visitors and is the oldest terracotta tower in Vietnam.