In the centuries since Boston’s founding, Deer Island has been used as an internment camp for Native Americans, a point of entry for Irish immigrants, and a prison. Now it’s home to a waste-water treatment plant and a state park.  Photo 3 of 12 in Boston Pops

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In the centuries since Boston’s founding, Deer Island has been used as an internment camp for Native Americans, a point of entry for Irish immigrants, and a prison. Now it’s home to a waste-water treatment plant and a state park.

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