Bunker
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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
The Flakturm at the Augarten in Vienna. Flak towers were used as both above-ground bunkers and anti-aircraft gun blockhouses by Nazi Germany
The north entrance to the Cheyenne Mountain Complex in Colorado, United States
Inside the Hill 60 Bunker, Port Kembla, New South Wales, Australia. One of many bunkers south of Sydney
In a Project 131 tunnel under the hills of Hubei
Fallout shelter
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A fallout shelter is an enclosed space specially designated to protect occupants from radioactive debris or fallout resulting from a nuclear explosion. Many such shelters were constructed as civil def
Bunker
…Submarine pen Fallout shelter Pillbox (military…
A fallout shelter sign in the United States of America, designed in 1961 by United States Army Corps of Engineers director of administrative logistics support function Robert W. Blakeley
Fallout shelter water storage can: a 66 liters (17+1⁄2 U.S. gal) barrel issued by the U.S. Department of Defense, Office of Civil Defense. 1963
Bosnia's Ark underground facility.
Željava underground military airport