This story originally aired on November 18, 2017.
If you go to the base of Point Defiance in Tacoma and look east, you'll see a finger of earth jutting into Puget Sound.
It formed as toxic slag spilled from a copper smelter during the city's industrial heyday.
For years, it was a foreboding sliver of black, glassy material. Today, workers and machines roam the peninsula as they transform it into a grassy park with Puget Sound views.