Advertisements Anyone watching this show? More info at http://www.travelchannel.com/TV_Shows/Off_Limits. I recently watched the "Dirty Secrets of Boston" of ep. The host is a bit nuts to want to venture down into a sewer. I was also intrigued by the sewage treatment plant. I had no idea how bad Boston Harbor had become (and why) until I saw this ep. I'd only heard inklings about how badly polluted it was. My first and only visit there was about a year ago and it seemed fine (not surprising due to the cleanup). Besides the above ep, I've watched a bit of the Los Angeles ep and will be recording the San Francisco and Seattle ones.