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

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

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

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

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

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

The world’s first penitentiary, meant to be humane, drove men insane.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

This abandoned factory on the Hudson River once churned out a million bricks a week.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A former connection to City Island, it has been abandoned since the 1930s.

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

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

A derelict bit of transportation infrastructure hidden in the woods.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A small Richmond island dotted with the remnants of hundreds of years of history.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.