A winding, cliffside stretch of road overlooking the Delaware River.

100 massive sculptures in the Hudson River Valley.

One man's swirling six-acre monument of stone.

This magnificent Japanese garden provides a moment of Zen in rural Vermont.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

Amazing views of Long Island Sound can be seen from this mountaintop tower.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

This once-private estate is now a dreamy, meditative garden that's open to the public.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Little Red Lighthouse under the George Washington Bridge.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.