Photo taken on April 28, 2013 shows Tomb of Tu Duc among the Complex of Hue Monuments heritage site located in Hue of Central Vietnam. 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]