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Look up bunker in Wiktionary, the free dictionary.
A military bunker is a hardened shelter, often buried partly or fully underground, designed to protect the inhabitants from falling bombs or other attacks. They were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control centers, and storage facilities (for example, in the event of nuclear war).

Bunkers in Albania
Articles for Bunker Types
Air-raid shelter
Blast shelter
Flak tower
Martello tower
Observation post
Line-Type Bunker Systems
Atlantic Wall
GHQ Line
Maginot Line
Siegfried Line
Taunton Stop Line
Contents
1 Types
1.1 Trench
1.2 Pillbox
1.3 Artillery
1.4 Industrial
1.5 Personal
2 Design
2.1 Blast protection
2.2 Nuclear protection
2.3 General features
3 Countermeasures
4 Famous installations
5 See also
6 Notes
//
Types
Trench
This type of bunker is a small concrete structure, partly dug into the ground, which is usually a part of a trench system. Such bunkers give the defending soldiers better protection than the open trench and also include top protection against aerial attack (grenades, mortar shells). They also provide shelter against the weather.
The front bunker of a trench system usually includes machine guns or mortars and forms a dominant shooting post. The rear bunkers are usually used as command posts or Tactical Operations Center (TOC), for storage and as field hospitals to attend to wounded soldiers.
Pillbox
Dug-in guard posts (with loopholes through which to fire weapons) made from concrete are also known as "pillboxes". The originally jocular name arose from their perceived similarity to the cylindrical boxes in which medical pills were once sold. They are in effect a trench firing step hardened to protect against small-arms fire and grenades and raised to improve the field of fire.

A World War II type 22 Pillbox on the Norfolk coast of England

Inside the Hill 60 Bunker, Port Kembla, New South Wales. One of many bunkers south of Sydney.
Their use seems to have developed during the period of the First World War when defence in depth using the Machine Gun Corps was being perfected. However, most of those seen in Britain, having been left over from the 1940 invasion scare, are designed for use by riflemen rather than for machine gunners. The concrete nature of pillboxes means that they are a feature of prepared positions and their original use is likely to have been in the Hindenburg Line. This is likely to have been the time when they acquired their incongruous English name. The Oxford English Dictionary's earliest record of the use of the word pillbox in connection with a defensive post is from 13 September 1917, after the German withdrawal onto the Hindenburg Line.
Pillboxes are often camouflaged in order to conceal their location and to maximize the element of surprise. They may be part of a trench system, form an interlocking line of defence with other pillboxes by providing covering fire to each other (defence in depth), or they may be placed to guard strategic structures such as bridges and jetties.
Many pillboxes were built before WWII in the Czech Republic in defence against the German invasion of Czechoslovakia. None of these were actually used in the end, since the German military met no resistance when invading the country because it was effectively forced to capitulate as a result of Allies annexing the country's border areas and handing them to Germany. The Japanese also made use of pillboxes in their fortifications of Iwo Jima.
Artillery
Many artillery installations, especially for naval artillery have historically been protected by extensive bunker systems. These usually housed the crews serving the weapons, protected the ammunition against counter-battery fire, and in numerous examples also protected the guns themselves, though this was usually a trade-off reducing their fields of fire.
Since artillery bunkers were often constructed for very large guns in a pre-defined location and as part of a larger system of defenses (such as for a port town or a seacoast), they are amongst the largest individual pre-Cold War bunker types found. The walls of installations like the 'Batterie Todt' in northern France were up to 3.5 m thick, with the gun inside capable of reaching over the English Channel to the opposite coast.
Mines & Caves converted to WWII Industrial Bunkers
Ebensee
Lager Rebstock
Mittelwerk
Saint Leu d'Esserent
Industrial
Typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. They were built mainly by nations like...(and so on)

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