Where were shelters in World War 2 built?

Answer 1

A shelter is basically an underground bunker. During World War 2 almost all nations that were subject to day and night time bombing from the air built underground shelters to protect their leadership as well as populations.

In the UK for example, the tube rail system was adapted to cater for London's population during the night time "blitz". The British government also built elaborate bunkers in old disused tube stations and under government buildings to house the wartime cabinet.

More often than not normal people simply converted their cellars into shelters, or in some cases built their own in the back of their property.

In Germany, bunker complexes were built under the Reich Chancellery buildings and Hitler had his own "Fuhrerbunker".