Photo taken on Jan. 4, 2015 shows the gate tower of the Thang Long Imperial Citadel which was built in the 11th century in Vietnam's capital Hanoi. So far, five cultural sites, namely Central Sector of the Imperial Citadel of Thang Long - Hanoi, Citadel of the Ho Dynasty, Complex of Hue Monuments, Hoi An Ancient Town, My Son Sanctuary, and one mixed site of Trang An Landscape Complex in Vietnam have been inscribed in the list of world heritages by UNESCO. (Photo: Xinhua/Zhang Jianhua)
