In the Ngoc Ha neighborhood of Ba Dinh district, just west of the citadel, a small lake called Huu Tiep contains the wreckage of a B-52 Stratofortress bomber shot down during Operation Linebacker II on December 27, 1972. Most of the fuselage sank into the shallow water, but sections of the airframe remain above the surface, still bearing the black-and-white star insignia of the United States Air Force. The wreck has been there for more than fifty years, oxidizing slowly in a lake ringed by modest houses and vegetable gardens.
The site is unmarked on most tourist maps and sits in a residential neighborhood you'd only find if you were looking for it. There's a small gateway and a concrete path around the lake's edge; locals swim and fish here. The contrast between the sheer scale of what a B-52 is — it was one of the largest aircraft ever built, carrying enough bombs to level a square kilometer — and its current state, subsiding into a suburban lake while children play on the bank above it, is hard to prepare for. No ticket, no museum, no organized tours: just the plane and the neighborhood that has grown up around it.