Peel back the outer layers of the city to discover secret wartime tunnels and hidden landmarks of the First Indochina War and the Vietnam War. Never lost and not forgotten, these underground dens and passages reveal the lives of the city’s residents in former times. First explore the underground passages of Gia Long Palace where former President Ngo Dinh Diem kept a secret bunker. Visit an apartment building that was used by the CIA before the Fall of Saigon in 1975. Explore a typical neighborhood house with a trapdoor leading to an old weapons bunker and raid a pho noodle restaurant that doubled as a secret command center where the Tet Offensive was planned.