Season 1, Episode 9
Dirty Secrets of Boston
Don explores the hidden corners of Boston to uncover how this city has been solving big problems with bold ideas. He gets access to the first subway in the US, an innovative sewage superhighway under the city, the 2nd largest waste treatment plant in the US that has helped Boston to clean up its infamously filthy harbor, a windmill that's a high tech source of green energy, a military stronghold and the remnants of forgotten towns, utterly destroyed to quench the city of Boston's thirst.
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