An abandoned Victorian-era mill in the middle of modern Manchester.

This enormous abandoned factory is now a makeshift graffiti gallery.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

Inside a state forest, the forgotten remains of a Cold War defensive installation.

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

An abandoned 146-acre summer resort slowly being reclaimed by nature.

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

This picturesque Victorian ghost town was once a thriving mill community.

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

The graffitied ruins stand hidden within the Pennsylvania woods.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

This Central New York ghost town was once a prosperous railroad community.

One of the last of the great 1920s movie palaces is a Floridian Greco-Spanish-Persian dreamscape.

Ruins of a historic medical facility sits eerily by the water.

An abandoned Depression-era zoo hidden just off the highway.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

A luxuriant botanical garden below sea level.

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

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

This elaborate towering structure was once famed for its revolutionary height.

Connecticut's shot tower is near the end of its life.

This railroad tunnel was once the longest in Massachusetts.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.