Stock Photo - Denver, Colorado - Rocky Flats National Wildlife Refuge,. The Refuge was formerly the site of a nuclear weapons plant that was extensively polluted with plutonium. The U. S. Fish and Wildlife Service opened much of the site to visitors in late 2018. A sign prohibits access to the central area, where nuclear weapons-related production occurred.

Stock Photo: Denver, Colorado - Rocky Flats National Wildlife Refuge, . The Refuge was formerly the site of a nuclear weapons plant that was extensively polluted with.

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