What buildings were not supposed to be hit by airplanes during World War 1?

Answer 1

strategic bombing during WW 1 was principally carried out by the United Kingdom and France for the Entente Powers Powers and Germany for the Central Powers. All the nations at war eventually engaged in such bombing, and, excepting Rome and Washington, the capital city of each major belligerent was targeted. A multi-national air force to strike at Germany was planned but never materialised. The aerial bombing of cities, intended to destroy the enemy's morale, was introduced by the Germans in the opening days of the war.

Early strategic bombing attempts led to the development of specialised bomber aircraft, during World War I. Initially bombs were dropped by hand and aimed by the naked eye, but by the end of the war bombsights had been developed. The introduction of air raid warnings and shelters can be dated to World War I, as can the design of anti-aircraft artilleryand the development of methods for coordinated aerial defence. Many of the advocates of strategic bombing during the interwar period, such as Italy's Giulio Douhet, America's Billy Mitchell, and Britain's Hugh Trenchard, had commanded aircraft during World War I. The improvements in aircraft technology during and after the war convinced many that "the bomber will always get through", and this belief influenced planning for strategic bombing in World War II.