Old car or trash dumps

Howdy everyone. I'm a magnet fisher and am always looking for new spots to check out. We've hit most bridges and quite a few marinas all over Cape, we've even hit MacMillan wharf in Ptown.

I'm curious if any of y'all are aware of ponds, streams or whatever that may have been used to dump things illegally. I enjoy cleaning the water and would appreciate your input.

I know Hawks Nest in Harwich saw some dumping going on decades ago, but I'm curious what other spots you may be aware of.

Thanks in advance!