People canoeing on the Gowanus Canal. Photo by Hannah Frishberg

A borough of superlatives, Brooklyn contains a number of toxic sites, not a few of which are also historic and storied. But walking by some of them, you wouldn’t necessarily know they’re hazardous.

While not everyone is concerned, we’re sure others would like to know where in Brooklyn toxic sites might be found — and some of the stories behind these former industrial sites. Below, some of the borough’s worst offenders.