Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Whimsical artist house in the New Jersey woods.

A tunnel with windows, so you don't miss out on the impressive views.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This remarkably simple jail went over a century without an escape.

A former copper mine which became a truly unsuccessful prison.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

This defunct, fortress-like prison has been the setting for several movies.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The 19th-century ruins hide deep in an overgrown forest.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

This island castle contains enough secret passageways to support a season of Scooby-Doo episodes.