Linebacker II was the last major American bombing campaign of the Vietnam War. It involved B-52 raids on the industrialized and heavily populated area between Ha Noi and Hiaphong.  On December 27, 1972, North Vietnamese surface to air missles in Ha Noi shot down a B-52 that landed in Huu Tiep Lake.  This tiny lake in the Ngoc Ha neighborhood of Ba Dinh District is known as B-52 Lake.  Part of the wreckage remains as a monument to the war effort.  I visited in 2016.

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A plaque describes the shoot down.  Photo credit: fredsharples/Flickr