thumb|The Flak tower|Flakturm at the [[Augarten in Vienna. Flak towers were used as both above-ground bunkers and anti-aircraft gun blockhouses by Nazi Germany]] thumb|The north entrance to the Cheyenne Mountain Complex in [[Colorado, United States]] A bunker is a defensive fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. They were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control
A bunker is a defensive structure, typically built underground, designed to protect people and important materials from bombs, artillery, and other attacks. Bunkers have been widely used during major conflicts like World Wars I and II and the Cold War to shelter weapons facilities and command centers.
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thumb|The Flak tower|Flakturm at the [[Augarten in Vienna. Flak towers were used as both above-ground bunkers and anti-aircraft gun blockhouses by Nazi Germany]] thumb|The north entrance to the Cheyenne Mountain Complex in [[Colorado, United States]] A bunker is a defensive fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. They were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control centers, storage facilities, etc. Bunkers can also be used as protection from tornadoes.
Trench bunkers are small concrete structures, partly dug into the ground. Many artillery installations, especially for coastal artillery, have historically been protected by extensive bunker systems. Typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. When a house is purpose-built with a bunker, the normal location is a reinforced below-ground bathroom with fiber-reinforced plastic shells. Bunkers deflect the blast wave from nearby explosions to prevent ear and internal injuries to people sheltering in the bunker. Nuclear bunkers must also cope with the underpressure that lasts for several seconds after the shock wave passes, and block radiation.
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