(CBS) — A legacy of the Cold War in Wheaton is disappearing, nearly 60 years after it opened.

It’s a nuclear bunker, built in Wheaton in 1958. For years, it has been under county government buildings.

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DuPage County Board Member Grant Eckhoff says the bunker won’t be easy to demolish with concrete walls that are two-feet thick, floors six-feet thick and a ceiling four-feet thick.

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Eckhoff says the bunker had its grand opening in 1958. U.S. Senator Everett Dirksen of Illinois attended the ceremony.

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A DuPage County spokesman tells WBBM the demolition project has an estimated cost of nearly $1 million.