According to the NYTimes, "Dead Horse Bay sits at the western edge of a marshland once dotted by more than two dozen horse-rendering plants, fish oil factories and garbage incinerators. From the 1850's until the 1930's, the carcasses of dead horses and other animals from New York City streets were used to manufacture glue, fertilizer and other products at the site. The chopped-up, boiled bones were later dumped into the water." Now the area is covered with glass bottles, many of which are still intact, along with old leather shoes, strange pieces of metal, plastic, and other unrecogniable iteams. Highly recommend you take a day trip out there. Just make sure you rock some boots.