Photo taken on June 13, 2013 shows the main gate of the Citadel of the Ho Dynasty in Vietnam's Thanh Hoa. 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)
