A peaceful international sculpture garden in upstate New York.

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

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Wine bottle sculpture with a ship's stateroom inside.

A natural gas leak provides a flickering flame beneath a waterfall.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

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

The last vessel built by a submarine pioneer stands as a monument to his legacy.

This large boulder was used as a lookout point by Revolutionary War militiamen.

This statue commemorates the importance of hat manufacturing to Danbury, once known as the "Hat City of the World."

The site where chief Miantonomo of the Narraganset people was captured.

A human attendant once directed car traffic from this structure before automated stoplights.

This roadside wonder is as mysterious as it is beloved.

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

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

Mansion and shopping center used in the 1975 film "The Stepford Wives."

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

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

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

A humble air museum located in an original World War II aircraft factory.

A small museum packed with specimens from important fossil sites and minerals from historical pegmatite quarries.