Hanoi, April 1 -- State President Luong Cuong and his spouse Nguyen Thi Minh Nguyet, together with King Philippe and Queen Mathilde of Belgium went for a tour of Thang Long Imperial Citadel at noon on April 1 as part of the latters' state visit to Vietnam. The distinguished guests walked through the Doan Mon gate (main gate) to visit the archaeological excavation site and stairways railed with stone dragons at the Kinh Thien Palace, which preserve numerous historical traces of the imperial citadel across different eras. The delegation also visited the Thang Long Imperial Palace's treasures exhibition hall, which displays nationally recognised treasures, including precious metals and high-quality ceramics manufactured by the royal Thang Lo...