Press beside a part ...: Press beside a part of the wall system of Thang Long ancient citadel on Hanoi Jan 31, 2004. This wall system along with a system of sewage and foundation has shown a great development in architecture of Vietnam's former dysnaties from 11th to 18th centuries. This Forbidden Citadel was uncoverd when a new National Assembly House was built in Hanoi in 2003. KTS photo/ Nguyen Hong Sam /Nguyen Hong Sam