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

One of the world's largest model railroads is a mind-boggling achievement.

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

World War II bunker still standing on the New Jersey beach.

One man's lifelong obsession with death.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Step inside Lucy, the world's largest "elephant."

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

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

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Series of storm drains connected to a dark urban legend.

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

A recently abandoned psych ward at the end of Sanatorium Road.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A unique sculpture park that specializes in the huge and bizarre.

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

Generations of rockhounds got their start at this beloved, historic mine.

This site was once the largest ski jump tower in the world.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.