There were many cities badly bombed during World War II, on all sides.London, Coventry, and so on, in England.Moscow, Stalingrad, and so on, in Russia.Berlin, Hamburg, and so on, in Germany.
livepool AN
In Japan Hiroshima and Nagasaki were bombed with the atom bombs, however Tokyo was bombed just as badly with thousands of bombs. There were cities in Europe that were nearly abolished as well.
Hiroshima and Nagasaki
Nearly every UK city was bombed during World War 2 but London and Coventry were probably destroyed the most.
Rotterdam (The Netherlands) was heavily bombarded as well.
London was bombed heavily in the early part of the war and Dresden, Germany was just about obliterated in Feb of 1945.
uk - coventry, exeter, london germany - dresden and berlin
London, because nearly 6000 people were killed in London alone.
During World War II, London and Dresden were two cities that experienced devastating bombing campaigns. London endured the Blitz, a sustained aerial bombardment by the German Luftwaffe from 1940 to 1941, causing significant destruction and loss of life. Dresden was heavily bombed in February 1945 by Allied forces, resulting in widespread devastation and a controversial high civilian death toll. Both cities remain symbols of the war's impact on urban centers.
Clydebank adjacent to Glasgow, was badly blitzed over two nights in March 1941, and the West of Glasgow got bombed with the fallout from Clydebank. Greenock was also badly bombed
Many countries have been badly bombed. Please ask a more specific question.