The National Park Service just turned 100. We visited one of its filthiest, most forgotten sites.

New York City is a giant, strange place.

Spread across four major landmasses and dozens of little islands, the metropolis is home to far more diverse natural landscapes than many people, including some of those who live there, may realize.

I visited one such place on a warm Sunday back in June: Dead Horse Bay, probably the filthiest, nastiest, and weirdest National Park Service land in America.

On the 100th anniversary of the NPS, we're revisiting images of this strange wasteland at the tip of Brooklyn that's managed by an agency more famous for pristine jewels like Yellowstone.

Take a moment and turn that name over in your mouth: Dead Horse Bay.

This place is home to the only beaches in New York City that lie vacant on a hot summer Sunday.

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Shattered glass saturates its sand so thoroughly that when waves crash in they tinkle like wind chimes. Scroll down to hear that spooky noise.

The bay is part of the Gateway National Recreation Area, a series of campsites, wetlands, and monuments scattered across eastern Brooklyn, Queens, and New Jersey and run by the National Park Service.

But it's hardly a normal place for a weekend excursion, and in the trash-filled waters lurk some uncomfortable lessons about the future of human civilization.

Here's what it's like there and what you need to know about it:

The bay sits in far southeast Brooklyn, with only a thin strip of land separating it from the Atlantic Ocean.

Zooming in, you can see that it's on the south side of a landmass called Barren Island. This just keeps getting better and not freaky at all, right?

To enter the bay, you first walk through some of the lushest, greenest paths found anywhere in New York.