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From between 1967 and 1986 the country of Albania built over 173,381 concrete bunkers, averaging out at 5.7 bunkers per square kilometer
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The elaborate German trench systems had several different lines, a phone system, and concrete bunkers in some places.
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Albania is absolutely littered with concrete bunkers, around 175,000 of them, or around 15 per sq mile. They were intended to aid in guerrilla warfare if the country was invaded, though most are now derelict.
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The New York Public Library's stacks are stored in a two story concrete bunker beneath Bryant Park
