Burrowed beneath a small park in Stockholm is a forgotten relic of the past that may help in the future.
Few countries do bunkers like Sweden, which never joined NATO and could be considered one of the world's most peaceful nations over the past 200 years.
It honeycombed itself with civil defense shelters during the Cold War and today around 65,000 remain on standby, dotted around its sparsely populated territory.
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